cnvd - cnvd-2021-16916

cnvd-2021-16916

Vulnerability from cnvd

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"
    }
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  "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

Modified

2024-08-04 16:25

Severity ?

CWE

CWE-285

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.

References

▼	URL	Tags
	https://bugzilla.redhat.com/show_bug.cgi?id=1900698	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202104-05	vendor-advisory, x_refsource_GENTOO
	https://security.netapp.com/advisory/ntap-20220325-0001/	x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	n/a	grub2	Version: grub 2.06

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
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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