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CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2023-5123 (GCVE-0-2023-5123)
Vulnerability from cvelistv5 – Published: 2024-02-14 15:06 – Updated: 2025-03-24 19:13
VLAI
Title
Improper Path Sanitization in JSON Datasource Plugin
Summary
The JSON datasource plugin ( https://grafana.com/grafana/plugins/marcusolsson-json-datasource/ ) is a Grafana Labs maintained plugin for Grafana that allows for retrieving and processing JSON data from a remote endpoint (including a specific sub-path) configured by an administrator. Due to inadequate sanitization of the dashboard-supplied path parameter, it was possible to include path traversal characters (../) in the path parameter and send requests to paths on the configured endpoint outside the configured sub-path.
This means that if the datasource was configured by an administrator to point at some sub-path of a domain (e.g. https://example.com/api/some_safe_api/ ), it was possible for an editor to create a dashboard referencing the datasource which issues queries containing path traversal characters, which would in turn cause the datasource to instead query arbitrary subpaths on the configured domain (e.g. https://example.com/api/admin_api/) .
In the rare case that this plugin is configured by an administrator to point back at the Grafana instance itself, this vulnerability becomes considerably more severe, as an administrator browsing a maliciously configured panel could be compelled to make requests to Grafana administrative API endpoints with their credentials, resulting in the potential for privilege escalation, hence the high score for this vulnerability.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Grafana | grafana-json-datasource |
Affected:
0.2.0 , < 1.3.21
(semver)
|
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CVE-2023-51364 (GCVE-0-2023-51364)
Vulnerability from cvelistv5 – Published: 2024-04-26 15:01 – Updated: 2024-08-02 22:32
VLAI
Title
QTS, QuTS hero, QuTScloud
Summary
A path traversal vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to read the contents of unexpected files and expose sensitive data via a network.
We have already fixed the vulnerability in the following versions:
QTS 5.1.4.2596 build 20231128 and later
QTS 4.5.4.2627 build 20231225 and later
QuTS hero h5.1.3.2578 build 20231110 and later
QuTS hero h4.5.4.2626 build 20231225 and later
QuTScloud c5.1.5.2651 and later
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| QNAP Systems Inc. | QTS |
Affected:
5.1.x , < 5.1.4.2596 build 20231128
(custom)
Affected: 4.5.x , < 4.5.4.2627 build 20231225 (custom) |
|
| QNAP Systems Inc. | QuTS hero |
Affected:
h5.1.x , < h5.1.3.2578 build 20231110
(custom)
Affected: h4.5.x , < h4.5.4.2626 build 20231225 (custom) |
|
| QNAP Systems Inc. | QuTScloud |
Affected:
c5.x.x , < c5.1.5.2651
(custom)
|
Credits
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CVE-2023-51365 (GCVE-0-2023-51365)
Vulnerability from cvelistv5 – Published: 2024-04-26 15:01 – Updated: 2024-08-02 22:32
VLAI
Title
QTS, QuTS hero, QuTScloud
Summary
A path traversal vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to read the contents of unexpected files and expose sensitive data via a network.
We have already fixed the vulnerability in the following versions:
QTS 5.1.4.2596 build 20231128 and later
QTS 4.5.4.2627 build 20231225 and later
QuTS hero h5.1.3.2578 build 20231110 and later
QuTS hero h4.5.4.2626 build 20231225 and later
QuTScloud c5.1.5.2651 and later
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| QNAP Systems Inc. | QTS |
Affected:
5.1.x , < 5.1.4.2596 build 20231128
(custom)
Affected: 4.5.x , < 4.5.4.2627 build 20231225 (custom) |
|
| QNAP Systems Inc. | QuTS hero |
Affected:
h5.1.x , < h5.1.3.2578 build 20231110
(custom)
Affected: h4.5.x , < h4.5.4.2626 build 20231225 (custom) |
|
| QNAP Systems Inc. | QuTScloud |
Unaffected:
c5.x , < c5.1.5.2651
(custom)
|
|
| qnap | qts |
Affected:
4.5.x , < 4.5.4.2627 build 20231225
(custom)
cpe:2.3:o:qnap:qts:-:*:*:*:*:*:*:* |
|
| qnap | quts_hero |
Affected:
h4.5.x , < h4.5.4.2626 build 20231225
(custom)
cpe:2.3:o:qnap:quts_hero:-:*:*:*:*:*:*:* |
|
| qnap | qts |
Affected:
5.1.x , < 5.1.4.2596 build 20231128
(custom)
cpe:2.3:a:qnap:qts:5.1.x:*:*:*:*:*:*:* |
|
| qnap | quts_hero |
Affected:
h5.1.x , < h5.1.3.2578 build 20231110
(custom)
cpe:2.3:a:qnap:quts_hero:h5.1.x:*:*:*:*:*:*:* |
Credits
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CVE-2023-51366 (GCVE-0-2023-51366)
Vulnerability from cvelistv5 – Published: 2024-09-06 16:26 – Updated: 2024-09-06 17:40
VLAI
Title
QTS, QuTS hero
Summary
A path traversal vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to read the contents of unexpected files and expose sensitive data via a network.
We have already fixed the vulnerability in the following versions:
QTS 5.1.6.2722 build 20240402 and later
QuTS hero h5.1.6.2734 build 20240414 and later
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| QNAP Systems Inc. | QTS |
Affected:
5.1.x , < 5.1.6.2722 build 20240402
(custom)
|
|
| QNAP Systems Inc. | QuTS hero |
Unaffected:
h5.1.x , < h5.1.6.2734 build 20240414
(custom)
|
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CVE-2023-51401 (GCVE-0-2023-51401)
Vulnerability from cvelistv5 – Published: 2024-05-17 08:40 – Updated: 2026-04-28 16:09
VLAI
Title
WordPress Ultimate Addons for Beaver Builder Premium plugin <= 1.35.13 - Limited Arbitrary File Download vulnerability
Summary
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Brainstorm Force Ultimate Addons for Beaver Builder allows Relative Path Traversal.This issue affects Ultimate Addons for Beaver Builder: from n/a through 1.35.13.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/vulnerability/bb-… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Brainstorm Force | Ultimate Addons for Beaver Builder |
Affected:
n/a , ≤ 1.35.13
(custom)
|
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CVE-2023-5142 (GCVE-0-2023-5142)
Vulnerability from cvelistv5 – Published: 2023-09-24 22:00 – Updated: 2024-08-02 07:52
VLAI
Title
H3C ER6300G2 Config File userLogin.asp path traversal
Summary
A vulnerability classified as problematic was found in H3C GR-1100-P, GR-1108-P, GR-1200W, GR-1800AX, GR-2200, GR-3200, GR-5200, GR-8300, ER2100n, ER2200G2, ER3200G2, ER3260G2, ER5100G2, ER5200G2 and ER6300G2 up to 20230908. This vulnerability affects unknown code of the file /userLogin.asp of the component Config File Handler. The manipulation leads to path traversal. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. VDB-240238 is the identifier assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
Severity
CWE
- CWE-22 - Path Traversal
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.240238 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.240238 | signaturepermissions-required |
| https://github.com/yinsel/CVE-H3C-Report | broken-linkexploit |
| https://github.com/CJCniubi666/H3C-ER/blob/main/R… | related |
Impacted products
15 products
| Vendor | Product | Version | |
|---|---|---|---|
| H3C | GR-1100-P |
Affected:
20230908
|
|
| H3C | GR-1108-P |
Affected:
20230908
|
|
| H3C | GR-1200W |
Affected:
20230908
|
|
| H3C | GR-1800AX |
Affected:
20230908
|
|
| H3C | GR-2200 |
Affected:
20230908
|
|
| H3C | GR-3200 |
Affected:
20230908
|
|
| H3C | GR-5200 |
Affected:
20230908
|
|
| H3C | GR-8300 |
Affected:
20230908
|
|
| H3C | ER2100n |
Affected:
20230908
|
|
| H3C | ER2200G2 |
Affected:
20230908
|
|
| H3C | ER3200G2 |
Affected:
20230908
|
|
| H3C | ER3260G2 |
Affected:
20230908
|
|
| H3C | ER5100G2 |
Affected:
20230908
|
|
| H3C | ER5200G2 |
Affected:
20230908
|
|
| H3C | ER6300G2 |
Affected:
20230908
|
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CVE-2023-51449 (GCVE-0-2023-51449)
Vulnerability from cvelistv5 – Published: 2023-12-22 20:58 – Updated: 2024-08-02 22:32
VLAI
Title
Make the `/file` secure against file traversal attacks
Summary
Gradio is an open-source Python package that allows you to quickly build a demo or web application for your machine learning model, API, or any arbitary Python function. Versions of `gradio` prior to 4.11.0 contained a vulnerability in the `/file` route which made them susceptible to file traversal attacks in which an attacker could access arbitrary files on a machine running a Gradio app with a public URL (e.g. if the demo was created with `share=True`, or on Hugging Face Spaces) if they knew the path of files to look for. This issue has been patched in version 4.11.0.
Severity
5.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/gradio-app/gradio/security/adv… | x_refsource_CONFIRM |
| https://github.com/gradio-app/gradio/commit/1b9d4… | x_refsource_MISC |
| https://github.com/gradio-app/gradio/commit/7ba8c… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| gradio-app | gradio |
Affected:
< 4.11.0
|
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CVE-2023-51599 (GCVE-0-2023-51599)
Vulnerability from cvelistv5 – Published: 2024-05-03 02:15 – Updated: 2024-09-18 18:30
VLAI
Title
Honeywell Saia PG5 Controls Suite Directory Traversal Remote Code Execution Vulnerability
Summary
Honeywell Saia PG5 Controls Suite Directory Traversal Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Honeywell Saia PG5 Controls Suite. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the parsing of ZIP files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of the current user.
. Was ZDI-CAN-18412.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.zerodayinitiative.com/advisories/ZDI-… | x_research-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Honeywell | Saia PG5 Controls Suite |
Affected:
PG5 v2.3.193
|
|
| honeywell | saia_pg5_controls_suite |
Affected:
r.47.0.0
cpe:2.3:a:honeywell:saia_pg5_controls_suite:-:*:*:*:*:*:*:* |
Date Public
2023-12-20 22:49
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CVE-2023-51603 (GCVE-0-2023-51603)
Vulnerability from cvelistv5 – Published: 2024-05-03 02:15 – Updated: 2024-09-18 18:30
VLAI
Title
Honeywell Saia PG5 Controls Suite CAB File Parsing Directory Traversal Remote Code Execution Vulnerability
Summary
Honeywell Saia PG5 Controls Suite CAB File Parsing Directory Traversal Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Honeywell Saia PG5 Controls Suite. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the parsing of CAB files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of the current user.
. Was ZDI-CAN-18592.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.zerodayinitiative.com/advisories/ZDI-… | x_research-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Honeywell | Saia PG5 Controls Suite |
Affected:
PG5 v2.3.193
|
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Affected:
R.47.0.0 AutoCAD 2021
Affected: R.47.0.0 AutoCAD LT 2021 cpe:2.3:a:honeywell:saia_pg5_controls_suite:-:*:*:*:*:*:*:* |
Date Public
2023-12-20 22:49
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CVE-2023-51639 (GCVE-0-2023-51639)
Vulnerability from cvelistv5 – Published: 2024-11-22 20:05 – Updated: 2024-11-25 16:41
VLAI
Title
Allegra downloadExportedChart Directory Traversal Authentication Bypass Vulnerability
Summary
Allegra downloadExportedChart Directory Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the downloadExportedChart action. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-22361.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.zerodayinitiative.com/advisories/ZDI-… | x_research-advisory |
| https://www.trackplus.com/en/service/release-note… | vendor-advisory |
Impacted products
Date Public
2024-02-09 18:17
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Mitigation ID: MIT-5.1
Phase: Implementation
Strategy: Input Validation
Description:
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
- Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation ID: MIT-15
Phase: Architecture and Design
Description:
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Mitigation ID: MIT-20.1
Phase: Implementation
Strategy: Input Validation
Description:
- Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
- Use a built-in path canonicalization function (such as realpath() in C) that produces the canonical version of the pathname, which effectively removes ".." sequences and symbolic links (CWE-23, CWE-59). This includes:
- realpath() in C
- getCanonicalPath() in Java
- GetFullPath() in ASP.NET
- realpath() or abs_path() in Perl
- realpath() in PHP
Mitigation ID: MIT-4
Phase: Architecture and Design
Strategy: Libraries or Frameworks
Description:
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Mitigation ID: MIT-29
Phase: Operation
Strategy: Firewall
Description:
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Mitigation ID: MIT-17
Phases: Architecture and Design, Operation
Strategy: Environment Hardening
Description:
- Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
Mitigation ID: MIT-21.1
Phase: Architecture and Design
Strategy: Enforcement by Conversion
Description:
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- For example, ID 1 could map to "inbox.txt" and ID 2 could map to "profile.txt". Features such as the ESAPI AccessReferenceMap [REF-185] provide this capability.
Mitigation ID: MIT-22
Phases: Architecture and Design, Operation
Strategy: Sandbox or Jail
Description:
- Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
- OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
- This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
- Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation ID: MIT-34
Phases: Architecture and Design, Operation
Strategy: Attack Surface Reduction
Description:
- Store library, include, and utility files outside of the web document root, if possible. Otherwise, store them in a separate directory and use the web server's access control capabilities to prevent attackers from directly requesting them. One common practice is to define a fixed constant in each calling program, then check for the existence of the constant in the library/include file; if the constant does not exist, then the file was directly requested, and it can exit immediately.
- This significantly reduces the chance of an attacker being able to bypass any protection mechanisms that are in the base program but not in the include files. It will also reduce the attack surface.
Mitigation ID: MIT-39
Phase: Implementation
Description:
- Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
- If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
- Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
- In the context of path traversal, error messages which disclose path information can help attackers craft the appropriate attack strings to move through the file system hierarchy.
Mitigation ID: MIT-16
Phases: Operation, Implementation
Strategy: Environment Hardening
Description:
- When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.
CAPEC-126: Path Traversal
An adversary uses path manipulation methods to exploit insufficient input validation of a target to obtain access to data that should be not be retrievable by ordinary well-formed requests. A typical variety of this attack involves specifying a path to a desired file together with dot-dot-slash characters, resulting in the file access API or function traversing out of the intended directory structure and into the root file system. By replacing or modifying the expected path information the access function or API retrieves the file desired by the attacker. These attacks either involve the attacker providing a complete path to a targeted file or using control characters (e.g. path separators (/ or \) and/or dots (.)) to reach desired directories or files.
CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic
This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple ways of encoding a URL and abuse the interpretation of the URL. A URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
CAPEC-78: Using Escaped Slashes in Alternate Encoding
This attack targets the use of the backslash in alternate encoding. An adversary can provide a backslash as a leading character and causes a parser to believe that the next character is special. This is called an escape. By using that trick, the adversary tries to exploit alternate ways to encode the same character which leads to filter problems and opens avenues to attack.
CAPEC-79: Using Slashes in Alternate Encoding
This attack targets the encoding of the Slash characters. An adversary would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the adversary many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.