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CNVD-2021-16938
Vulnerability from cnvd - Published: 2021-03-11
VLAI Severity ?
Title
grub2数据伪造问题漏洞
Description
grub2是GNU计划的一款Linux系统引导程序。
GRUB2 2.04及之前版本中存在数据伪造问题漏洞。该漏洞源于当无shim直接启动时，程序未验证内核签名。攻击者可利用该漏洞绕过安全启动。
Severity
中
Patch Name
grub2数据伪造问题漏洞的补丁
Patch Description
grub2是GNU计划的一款Linux系统引导程序。
GRUB2 2.04及之前版本中存在数据伪造问题漏洞。该漏洞源于当无shim直接启动时，程序未验证内核签名。攻击者可利用该漏洞绕过安全启动。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description
厂商已发布了漏洞修复程序，请及时关注更新： https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
Reference
http://www.openwall.com/lists/oss-security/2020/07/29/3
Impacted products
| Name | GNU GRUB2 <=2.04 |
|---|
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CVE-2020-15705 (GCVE-0-2020-15705)
Vulnerability from cvelistv5 – Published: 2020-07-29 17:45 – Updated: 2024-09-17 00:06
VLAI?
EPSS
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.
Severity ?
6.4 (Medium)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Ubuntu | grub2 in Ubuntu |
Affected:
20.04 LTS , < 2.04-1ubuntu26.1
(custom)
Affected: 18.04 LTS , < 2.02-2ubuntu8.16 (custom) Affected: 16.04 LTS , < 2.02~beta2-36ubuntu3.26 (custom) Affected: 14.04 ESM , < 2.02~beta2-9ubuntu1.20 (custom) |
Credits
Mathieu Trudel-Lapierre
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"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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