Vulnerability-Lookup

CNVD-2021-16916

Vulnerability from cnvd - Published: 2021-03-12

Title

grub2授权问题漏洞

Description

grub2是GNU社区的一款Linux系统引导程序。在2.06之前版本的grub2中存在安全漏洞，cutmem命令未支持安全引导锁定，允许有特权的攻击者从内存中删除地址范围，从而在对grub的内存布局进行正确分类后，有机会绕过安全引导保护。此漏洞的最大威胁是数据机密性和完整性以及系统可用性。

Severity

中

Patch Name

grub2授权问题漏洞的补丁

Patch Description

grub2是GNU社区的一款Linux系统引导程序。在2.06之前版本的grub2中存在安全漏洞，cutmem命令未支持安全引导锁定，允许有特权的攻击者从内存中删除地址范围，从而在对grub的内存布局进行正确分类后，有机会绕过安全引导保护。此漏洞的最大威胁是数据机密性和完整性以及系统可用性。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.debian.org/debian-security-announce/2021/msg00048.html

Reference

https://access.redhat.com/security/cve/cve-2020-27779

Impacted products

Name
GNU GRUB2 <2.06

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-27779",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-27779"
    }
  },
  "description": "grub2\u662fGNU\u793e\u533a\u7684\u4e00\u6b3eLinux\u7cfb\u7edf\u5f15\u5bfc\u7a0b\u5e8f\u3002\n\n\u57282.06\u4e4b\u524d\u7248\u672c\u7684grub2\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0ccutmem\u547d\u4ee4\u672a\u652f\u6301\u5b89\u5168\u5f15\u5bfc\u9501\u5b9a\uff0c\u5141\u8bb8\u6709\u7279\u6743\u7684\u653b\u51fb\u8005\u4ece\u5185\u5b58\u4e2d\u5220\u9664\u5730\u5740\u8303\u56f4\uff0c\u4ece\u800c\u5728\u5bf9grub\u7684\u5185\u5b58\u5e03\u5c40\u8fdb\u884c\u6b63\u786e\u5206\u7c7b\u540e\uff0c\u6709\u673a\u4f1a\u7ed5\u8fc7\u5b89\u5168\u5f15\u5bfc\u4fdd\u62a4\u3002\u6b64\u6f0f\u6d1e\u7684\u6700\u5927\u5a01\u80c1\u662f\u6570\u636e\u673a\u5bc6\u6027\u548c\u5b8c\u6574\u6027\u4ee5\u53ca\u7cfb\u7edf\u53ef\u7528\u6027\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://lists.debian.org/debian-security-announce/2021/msg00048.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-16916",
  "openTime": "2021-03-12",
  "patchDescription": "grub2\u662fGNU\u793e\u533a\u7684\u4e00\u6b3eLinux\u7cfb\u7edf\u5f15\u5bfc\u7a0b\u5e8f\u3002\r\n\r\n\u57282.06\u4e4b\u524d\u7248\u672c\u7684grub2\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0ccutmem\u547d\u4ee4\u672a\u652f\u6301\u5b89\u5168\u5f15\u5bfc\u9501\u5b9a\uff0c\u5141\u8bb8\u6709\u7279\u6743\u7684\u653b\u51fb\u8005\u4ece\u5185\u5b58\u4e2d\u5220\u9664\u5730\u5740\u8303\u56f4\uff0c\u4ece\u800c\u5728\u5bf9grub\u7684\u5185\u5b58\u5e03\u5c40\u8fdb\u884c\u6b63\u786e\u5206\u7c7b\u540e\uff0c\u6709\u673a\u4f1a\u7ed5\u8fc7\u5b89\u5168\u5f15\u5bfc\u4fdd\u62a4\u3002\u6b64\u6f0f\u6d1e\u7684\u6700\u5927\u5a01\u80c1\u662f\u6570\u636e\u673a\u5bc6\u6027\u548c\u5b8c\u6574\u6027\u4ee5\u53ca\u7cfb\u7edf\u53ef\u7528\u6027\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "grub2\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "GNU GRUB2 \u003c2.06"
  },
  "referenceLink": "https://access.redhat.com/security/cve/cve-2020-27779",
  "serverity": "\u4e2d",
  "submitTime": "2021-03-05",
  "title": "grub2\u6388\u6743\u95ee\u9898\u6f0f\u6d1e"
}

CVE-2020-27779 (GCVE-0-2020-27779)

Vulnerability from cvelistv5 – Published: 2021-03-03 16:40 – Updated: 2024-08-04 16:25

Summary

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity

No CVSS data available.

CWE

CWE-285

Assigner

redhat redhat root

References

4 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1900698	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202104-05	vendor-advisoryx_refsource_GENTOO
https://security.netapp.com/advisory/ntap-2022032…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	grub2	Affected: grub 2.06

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.