ID CVE-2017-7675
Summary The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.0.M21 and 8.5.0 to 8.5.15 bypassed a number of security checks that prevented directory traversal attacks. It was therefore possible to bypass security constraints using a specially crafted URL.
References
Vulnerable Configurations
  • Apache Software Foundation Tomcat 8.5.0
    cpe:2.3:a:apache:tomcat:8.5.0
  • Apache Software Foundation Tomcat 8.5.1
    cpe:2.3:a:apache:tomcat:8.5.1
  • Apache Software Foundation Tomcat 8.5.2
    cpe:2.3:a:apache:tomcat:8.5.2
  • Apache Software Foundation Tomcat 8.5.3
    cpe:2.3:a:apache:tomcat:8.5.3
  • Apache Software Foundation Tomcat 8.5.4
    cpe:2.3:a:apache:tomcat:8.5.4
  • Apache Software Foundation Tomcat 8.5.5
    cpe:2.3:a:apache:tomcat:8.5.5
  • Apache Software Foundation Tomcat 8.5.6
    cpe:2.3:a:apache:tomcat:8.5.6
  • Apache Software Foundation Tomcat 8.5.7
    cpe:2.3:a:apache:tomcat:8.5.7
  • Apache Software Foundation Tomcat 8.5.8
    cpe:2.3:a:apache:tomcat:8.5.8
  • Apache Software Foundation Tomcat 8.5.9
    cpe:2.3:a:apache:tomcat:8.5.9
  • Apache Software Foundation Tomcat 8.5.10
    cpe:2.3:a:apache:tomcat:8.5.10
  • Apache Software Foundation Tomcat 8.5.11
    cpe:2.3:a:apache:tomcat:8.5.11
  • Apache Software Foundation Tomcat 8.5.12
    cpe:2.3:a:apache:tomcat:8.5.12
  • Apache Software Foundation Tomcat 8.5.13
    cpe:2.3:a:apache:tomcat:8.5.13
  • Apache Software Foundation Tomcat 8.5.14
    cpe:2.3:a:apache:tomcat:8.5.14
  • Apache Software Foundation Tomcat 8.5.15
    cpe:2.3:a:apache:tomcat:8.5.15
  • Apache Software Foundation Tomcat 9.0.0 M1
    cpe:2.3:a:apache:tomcat:9.0.0:m1
  • Apache Software Foundation Tomcat 9.0.0 M10
    cpe:2.3:a:apache:tomcat:9.0.0:m10
  • Apache Software Foundation Tomcat 9.0.0 M11
    cpe:2.3:a:apache:tomcat:9.0.0:m11
  • Apache Software Foundation Tomcat 9.0.0 M12
    cpe:2.3:a:apache:tomcat:9.0.0:m12
  • Apache Software Foundation Tomcat 9.0.0 M13
    cpe:2.3:a:apache:tomcat:9.0.0:m13
  • Apache Software Foundation Tomcat 9.0.0 M14
    cpe:2.3:a:apache:tomcat:9.0.0:m14
  • Apache Software Foundation Tomcat 9.0.0 M15
    cpe:2.3:a:apache:tomcat:9.0.0:m15
  • Apache Software Foundation Tomcat 9.0.0 M16
    cpe:2.3:a:apache:tomcat:9.0.0:m16
  • Apache Software Foundation Tomcat 9.0.0 M17
    cpe:2.3:a:apache:tomcat:9.0.0:m17
  • Apache Software Foundation Tomcat 9.0.0 M18
    cpe:2.3:a:apache:tomcat:9.0.0:m18
  • Apache Software Foundation Tomcat 9.0.0 M19
    cpe:2.3:a:apache:tomcat:9.0.0:m19
  • Apache Software Foundation Tomcat 9.0.0 M2
    cpe:2.3:a:apache:tomcat:9.0.0:m2
  • Apache Software Foundation Tomcat 9.0.0 M20
    cpe:2.3:a:apache:tomcat:9.0.0:m20
  • Apache Software Foundation Tomcat 9.0.0 M21
    cpe:2.3:a:apache:tomcat:9.0.0:m21
  • Apache Software Foundation Tomcat 9.0.0 M3
    cpe:2.3:a:apache:tomcat:9.0.0:m3
  • Apache Software Foundation Tomcat 9.0.0 M4
    cpe:2.3:a:apache:tomcat:9.0.0:m4
  • Apache Software Foundation Tomcat 9.0.0 M5
    cpe:2.3:a:apache:tomcat:9.0.0:m5
  • Apache Software Foundation Tomcat 9.0.0 M6
    cpe:2.3:a:apache:tomcat:9.0.0:m6
  • Apache Software Foundation Tomcat 9.0.0 M7
    cpe:2.3:a:apache:tomcat:9.0.0:m7
  • Apache Software Foundation Tomcat 9.0.0 M8
    cpe:2.3:a:apache:tomcat:9.0.0:m8
  • Apache Software Foundation Tomcat 9.0.0 M9
    cpe:2.3:a:apache:tomcat:9.0.0:m9
CVSS
Base: 5.0
Impact:
Exploitability:
CWE CWE-22
CAPEC
  • Relative Path Traversal
    An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
  • Directory Traversal
    An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
  • File System Function Injection, Content Based
    An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
  • 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 way of encoding an URL and abuse the interpretation of the URL. An 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.
  • Manipulating 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.
  • Using Escaped Slashes in Alternate Encoding
    This attack targets the use of the backslash in alternate encoding. An attacker 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 attacker tries to exploit alternate ways to encode the same character which leads to filter problems and opens avenues to attack.
  • Using Slashes in Alternate Encoding
    This attack targets the encoding of the Slash characters. An attacker 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 attacker 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.
nessus via4
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-3974.NASL
    description Two issues were discovered in the Tomcat servlet and JSP engine. - CVE-2017-7674 Rick Riemer discovered that the Cross-Origin Resource Sharing filter did not add a Vary header indicating possible different responses, which could lead to cache poisoning. - CVE-2017-7675 (stretch only) Markus Dorschmidt found that the HTTP/2 implementation bypassed some security checks, thus allowing an attacker to conduct directory traversal attacks by using specially crafted URLs.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 103259
    published 2017-09-18
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=103259
    title Debian DSA-3974-1 : tomcat8 - security update
  • NASL family Web Servers
    NASL id TOMCAT_9_0_0_M22.NASL
    description The version of Apache Tomcat installed on the remote host is 9.0.0.M1 or later but prior to 9.0.0.M22. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the CORS filter because the HTTP Vary header was not properly added. This allows a remote attacker to conduct client-side and server-side cache poisoning attacks. (CVE-2017-7674) - A flaw exists in the HTTP/2 implementation that bypasses a number of security checks that prevented directory traversal attacks. A remote attacker can exploit this to bypass security constraints. (CVE-2017-7675) Note that Nessus has not attempted to exploit this issue but has instead relied only on the application's self-reported version number.
    last seen 2019-02-21
    modified 2018-08-03
    plugin id 102590
    published 2017-08-18
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=102590
    title Apache Tomcat 9.0.0M1 < 9.0.0.M22 Multiple Vulnerabilities
  • NASL family Web Servers
    NASL id TOMCAT_8_5_16.NASL
    description The version of Apache Tomcat installed on the remote host is 8.5.x prior to 8.5.16. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the CORS filter because the HTTP Vary header was not properly added. This allows a remote attacker to conduct client-side and server-side cache poisoning attacks. (CVE-2017-7674) - A flaw exists in the HTTP/2 implementation that bypasses a number of security checks that prevented directory traversal attacks. A remote attacker can exploit this to bypass security constraints. (CVE-2017-7675) Note that Nessus has not attempted to exploit this issue but has instead relied only on the application's self-reported version number.
    last seen 2019-02-21
    modified 2018-08-01
    plugin id 102589
    published 2017-08-18
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=102589
    title Apache Tomcat 8.5.x < 8.5.16 Multiple Vulnerabilities
refmap via4
bid 100256
confirm https://security.netapp.com/advisory/ntap-20180614-0003/
debian DSA-3974
mlist
  • [announce] 20170810 [UPDATE][SECURITY] CVE-2017-7675 Apache Tomcat Security Constraint Bypass
  • [tomcat-dev] 20190319 svn commit: r1855831 [24/30] - in /tomcat/site/trunk: ./ docs/ xdocs/
  • [tomcat-dev] 20190319 svn commit: r1855831 [25/30] - in /tomcat/site/trunk: ./ docs/ xdocs/
  • [tomcat-dev] 20190325 svn commit: r1856174 [23/29] - in /tomcat/site/trunk: docs/ xdocs/ xdocs/stylesheets/
  • [tomcat-dev] 20190325 svn commit: r1856174 [24/29] - in /tomcat/site/trunk: docs/ xdocs/ xdocs/stylesheets/
  • [tomcat-dev] 20190413 svn commit: r1857494 [17/20] - in /tomcat/site/trunk: ./ docs/ xdocs/
  • [tomcat-dev] 20190413 svn commit: r1857496 [3/4] - in /tomcat/site/trunk: ./ docs/ xdocs/
  • [tomcat-dev] 20190415 svn commit: r1857582 [18/22] - in /tomcat/site/trunk: docs/ xdocs/stylesheets/
  • [tomcat-dev] 20190415 svn commit: r1857582 [19/22] - in /tomcat/site/trunk: docs/ xdocs/stylesheets/
Last major update 10-08-2017 - 22:29
Published 10-08-2017 - 22:29
Last modified 12-06-2019 - 13:29
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