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CERTFR-2020-AVI-476
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu. Elles permettent à un attaquant de provoquer une exécution de code arbitraire et un contournement de la politique de sécurité.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
NoneImpacted products
References
Title | Publication Time | Tags | |||
---|---|---|---|---|---|
|
{ "$ref": "https://www.cert.ssi.gouv.fr/openapi.json", "affected_systems": [ { "description": "Ubuntu 16.04 LTS", "product": { "name": "Ubuntu", "vendor": { "name": "Ubuntu", "scada": false } } }, { "description": "Ubuntu 18.04 LTS", "product": { "name": "Ubuntu", "vendor": { "name": "Ubuntu", "scada": false } } }, { "description": "Ubuntu 20.04 LTS", "product": { "name": "Ubuntu", "vendor": { "name": "Ubuntu", "scada": false } } }, { "description": "Ubuntu 14.04 ESM", "product": { "name": "Ubuntu", "vendor": { "name": "Ubuntu", "scada": false } } } ], "affected_systems_content": null, "content": "## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n", "cves": [ { "name": "CVE-2020-15707", "url": "https://www.cve.org/CVERecord?id=CVE-2020-15707" }, { "name": "CVE-2020-14311", "url": "https://www.cve.org/CVERecord?id=CVE-2020-14311" }, { "name": "CVE-2020-14310", "url": "https://www.cve.org/CVERecord?id=CVE-2020-14310" }, { "name": "CVE-2020-14308", "url": "https://www.cve.org/CVERecord?id=CVE-2020-14308" }, { "name": "CVE-2020-10713", "url": "https://www.cve.org/CVERecord?id=CVE-2020-10713" }, { "name": "CVE-2020-15706", "url": "https://www.cve.org/CVERecord?id=CVE-2020-15706" }, { "name": "CVE-2020-15705", "url": "https://www.cve.org/CVERecord?id=CVE-2020-15705" }, { "name": "CVE-2020-14309", "url": "https://www.cve.org/CVERecord?id=CVE-2020-14309" } ], "initial_release_date": "2020-07-30T00:00:00", "last_revision_date": "2020-07-30T00:00:00", "links": [], "reference": "CERTFR-2020-AVI-476", "revisions": [ { "description": "Version initiale", "revision_date": "2020-07-30T00:00:00.000000" } ], "risks": [ { "description": "Ex\u00e9cution de code arbitraire" }, { "description": "Contournement de la politique de s\u00e9curit\u00e9" } ], "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans le noyau Linux\nd\u0027Ubuntu. Elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de\ncode arbitraire et un contournement de la politique de s\u00e9curit\u00e9.\n", "title": "Multiples vuln\u00e9rabilit\u00e9s dans le noyau Linux d\u0027Ubuntu", "vendor_advisories": [ { "published_at": null, "title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-4432-1 du 29 juillet 2020", "url": "https://ubuntu.com/security/notices/USN-4432-1" } ] }
CVE-2020-15706 (GCVE-0-2020-15706)
Vulnerability from cvelistv5
Published
2020-07-29 17:45
Modified
2024-09-16 22:20
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-362 - Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)
Summary
GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.
References
Impacted products
Vendor | Product | Version | ||
---|---|---|---|---|
Ubuntu | grub2 in Ubuntu |
Version: 20.04 LTS < 2.04-1ubuntu26.1 Version: 18.04 LTS < 2.02-2ubuntu8.16 Version: 16.04 LTS < 2.02~beta2-36ubuntu3.26 Version: 14.04 ESM < 2.02~beta2-9ubuntu1.20 |
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This issue affects GRUB2 version 2.04 and prior versions." } ] }, "generator": { "engine": "Vulnogram 0.0.9" }, "impact": { "cvss": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-362 Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)" } ] } ] }, "references": { "reference_data": [ { "name": "https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/", "refsource": "CONFIRM", "url": "https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/" }, { "name": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass", "refsource": "UBUNTU", "url": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass" }, { "name": "http://ubuntu.com/security/notices/USN-4432-1", "refsource": "UBUNTU", "url": "http://ubuntu.com/security/notices/USN-4432-1" }, { "name": "https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot" }, { "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011", "refsource": "CONFIRM", "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011" }, { "name": "https://access.redhat.com/security/vulnerabilities/grub2bootloader", "refsource": "REDHAT", "url": "https://access.redhat.com/security/vulnerabilities/grub2bootloader" }, { "name": "https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/", "refsource": "SUSE", "url": "https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/" }, { "name": "https://www.suse.com/support/kb/doc/?id=000019673", "refsource": "SUSE", "url": "https://www.suse.com/support/kb/doc/?id=000019673" }, { "name": "https://www.openwall.com/lists/oss-security/2020/07/29/3", "refsource": "CONFIRM", "url": "https://www.openwall.com/lists/oss-security/2020/07/29/3" }, { "name": "https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html", "refsource": "CONFIRM", "url": "https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html" }, { "name": "DSA-4735", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2020/dsa-4735" }, { "name": "[oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2020/07/29/3" }, { "name": "https://security.netapp.com/advisory/ntap-20200731-0008/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20200731-0008/" }, { "name": "USN-4432-1", "refsource": "UBUNTU", "url": "https://usn.ubuntu.com/4432-1/" }, { "name": "openSUSE-SU-2020:1169", "refsource": "SUSE", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html" }, { "name": "openSUSE-SU-2020:1168", "refsource": "SUSE", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html" }, { "name": "GLSA-202104-05", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202104-05" } ] }, "source": { "advisory": "USN 4432-1", "discovery": "INTERNAL" } } } }, "cveMetadata": { "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "assignerShortName": "canonical", "cveId": "CVE-2020-15706", "datePublished": "2020-07-29T17:45:33.975497Z", "dateReserved": "2020-07-14T00:00:00", "dateUpdated": "2024-09-16T22:20:56.598Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }
CVE-2020-15707 (GCVE-0-2020-15707)
Vulnerability from cvelistv5
Published
2020-07-29 17:45
Modified
2024-09-17 03:07
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-362 - Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)
Summary
Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.
References
URL | Tags | ||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Impacted products
Vendor | Product | Version | ||
---|---|---|---|---|
Ubuntu | grub2 in Ubuntu |
Version: 20.04 LTS < 2.04-1ubuntu26.1 Version: 18.04 LTS < 2.02-2ubuntu8.16 Version: 16.04 LTS < 2.02~beta2-36ubuntu3.26 Version: 14.04 ESM < 2.02~beta2-9ubuntu1.20 |
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These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. 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CVE-2020-14310 (GCVE-0-2020-14310)
Vulnerability from cvelistv5
Published
2020-07-31 20:55
Modified
2024-08-04 12:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.
References
URL | Tags | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Impacted products
Vendor | Product | Version | ||
---|---|---|---|---|
The Grub2 Project | grub2 |
Version: 2.06 |
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CVE-2020-14311 (GCVE-0-2020-14311)
Vulnerability from cvelistv5
Published
2020-07-31 20:56
Modified
2024-08-04 12:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.
References
URL | Tags | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Impacted products
Vendor | Product | Version | ||
---|---|---|---|---|
The Grub2 Project | grub2 |
Version: 2.06 |
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CVE-2020-10713 (GCVE-0-2020-10713)
Vulnerability from cvelistv5
Published
2020-07-30 12:58
Modified
2024-08-04 11:14
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Out-of-bounds Write leading to Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Summary
A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to establish access to the system such as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a networked system with root access. With this access, an attacker could then craft a string to cause a buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
References
URL | Tags | ||||||||||||||||||||||||||||||||||||||||
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An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to establish access to the system such as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a networked system with root access. With this access, an attacker could then craft a string to cause a buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. 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CVE-2020-14308 (GCVE-0-2020-14308)
Vulnerability from cvelistv5
Published
2020-07-29 19:03
Modified
2024-08-04 12:39
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Integer Overflow or Wraparound leading to Heap-based Buffer Overflow
Summary
In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This leads the function to return invalid memory allocations which can be further used to cause possible integrity, confidentiality and availability impacts during the boot process.
References
URL | Tags | |||||||||||||||||||||||||||||||
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|
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CVE-2020-15705 (GCVE-0-2020-15705)
Vulnerability from cvelistv5
Published
2020-07-29 17:45
Modified
2024-09-17 00:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Summary
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.
References
URL | Tags | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Impacted products
Vendor | Product | Version | ||
---|---|---|---|---|
Ubuntu | grub2 in Ubuntu |
Version: 20.04 LTS < 2.04-1ubuntu26.1 Version: 18.04 LTS < 2.02-2ubuntu8.16 Version: 16.04 LTS < 2.02~beta2-36ubuntu3.26 Version: 14.04 ESM < 2.02~beta2-9ubuntu1.20 |
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"vendor_name": "Ubuntu" } ] } }, "credit": [ { "lang": "eng", "value": "Mathieu Trudel-Lapierre" } ], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions." } ] }, "generator": { "engine": "Vulnogram 0.0.9" }, "impact": { "cvss": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-347 Improper Verification of Cryptographic Signature" } ] } ] }, "references": { "reference_data": [ { "name": "https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/", "refsource": "CONFIRM", "url": "https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/" }, { "name": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass", "refsource": "UBUNTU", "url": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass" }, { "name": "http://ubuntu.com/security/notices/USN-4432-1", "refsource": "UBUNTU", "url": "http://ubuntu.com/security/notices/USN-4432-1" }, { "name": "https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot" }, { "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011", "refsource": "CONFIRM", "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011" }, { "name": "https://access.redhat.com/security/vulnerabilities/grub2bootloader", "refsource": "REDHAT", "url": "https://access.redhat.com/security/vulnerabilities/grub2bootloader" }, { "name": "https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/", "refsource": "SUSE", "url": "https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/" }, { "name": "https://www.suse.com/support/kb/doc/?id=000019673", "refsource": "SUSE", "url": "https://www.suse.com/support/kb/doc/?id=000019673" }, { "name": "https://www.openwall.com/lists/oss-security/2020/07/29/3", "refsource": "CONFIRM", "url": "https://www.openwall.com/lists/oss-security/2020/07/29/3" }, { "name": "https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html", "refsource": "CONFIRM", "url": "https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html" }, { "name": "[oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2020/07/29/3" }, { "name": "https://security.netapp.com/advisory/ntap-20200731-0008/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20200731-0008/" }, { "name": "USN-4432-1", "refsource": "UBUNTU", "url": "https://usn.ubuntu.com/4432-1/" }, { "name": "openSUSE-SU-2020:1280", "refsource": "SUSE", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html" }, { "name": "openSUSE-SU-2020:1282", "refsource": "SUSE", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html" }, { "name": "[oss-security] 20210302 Multiple GRUB2 vulnerabilities", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/03/02/3" }, { "name": "GLSA-202104-05", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202104-05" }, { "name": "[oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros list", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/09/17/2" }, { "name": "[oss-security] 20210917 Re: Containers-optimized OS (COS) membership in the linux-distros list", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/09/17/4" }, { "name": "[oss-security] 20210920 Re: Containers-optimized OS (COS) membership in the linux-distros list", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/09/21/1" } ] }, "source": { "advisory": "USN 4432-1", "defect": [ "https://launchpad.net/bugs/1801968" ], "discovery": "INTERNAL" } } } }, "cveMetadata": { "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "assignerShortName": "canonical", "cveId": "CVE-2020-15705", "datePublished": "2020-07-29T17:45:33.422001Z", "dateReserved": "2020-07-14T00:00:00", "dateUpdated": "2024-09-17T00:06:01.169Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }
CVE-2020-14309 (GCVE-0-2020-14309)
Vulnerability from cvelistv5
Published
2020-07-30 12:49
Modified
2024-08-04 12:39
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Integer Overflow or Wraparound leading to Heap-based Buffer Overflow
Summary
There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.
References
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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