Vulnerability-Lookup

CNVD-2021-16935

Vulnerability from cnvd - Published: 2021-03-11

Title

grub2缓冲区溢出漏洞（CNVD-2021-16935）

Description

grub2是GNU社区的一款Linux系统引导程序。 2.06之前版本的grub2中存在安全漏洞。菜单呈现代码中的Setparam_prefix（）执行长度计算，前提是表示带引号的单引号需要3个字符，而实际上需要4个字符，这使得攻击者可以为输入中的每个引号破坏一个字节的内存。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。目前没有详细漏洞细节提供。

Severity

高

Patch Name

grub2缓冲区溢出漏洞（CNVD-2021-16935）的补丁

Patch Description

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://packetstormsecurity.com/files/161627/Red-Hat-Security-Advisory-2021-0698-01.html

Impacted products

Name
GNU GRUB2 <2.06

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-20233",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-20233"
    }
  },
  "description": "grub2\u662fGNU\u793e\u533a\u7684\u4e00\u6b3eLinux\u7cfb\u7edf\u5f15\u5bfc\u7a0b\u5e8f\u3002\n\n2.06\u4e4b\u524d\u7248\u672c\u7684grub2\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u83dc\u5355\u5448\u73b0\u4ee3\u7801\u4e2d\u7684Setparam_prefix\uff08\uff09\u6267\u884c\u957f\u5ea6\u8ba1\u7b97\uff0c\u524d\u63d0\u662f\u8868\u793a\u5e26\u5f15\u53f7\u7684\u5355\u5f15\u53f7\u9700\u89813\u4e2a\u5b57\u7b26\uff0c\u800c\u5b9e\u9645\u4e0a\u9700\u89814\u4e2a\u5b57\u7b26\uff0c\u8fd9\u4f7f\u5f97\u653b\u51fb\u8005\u53ef\u4ee5\u4e3a\u8f93\u5165\u4e2d\u7684\u6bcf\u4e2a\u5f15\u53f7\u7834\u574f\u4e00\u4e2a\u5b57\u8282\u7684\u5185\u5b58\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\u6ca1\u6709\u8be6\u7ec6\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\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-2021-16935",
  "openTime": "2021-03-11",
  "patchDescription": "grub2\u662fGNU\u793e\u533a\u7684\u4e00\u6b3eLinux\u7cfb\u7edf\u5f15\u5bfc\u7a0b\u5e8f\u3002\r\n\r\n2.06\u4e4b\u524d\u7248\u672c\u7684grub2\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u83dc\u5355\u5448\u73b0\u4ee3\u7801\u4e2d\u7684Setparam_prefix\uff08\uff09\u6267\u884c\u957f\u5ea6\u8ba1\u7b97\uff0c\u524d\u63d0\u662f\u8868\u793a\u5e26\u5f15\u53f7\u7684\u5355\u5f15\u53f7\u9700\u89813\u4e2a\u5b57\u7b26\uff0c\u800c\u5b9e\u9645\u4e0a\u9700\u89814\u4e2a\u5b57\u7b26\uff0c\u8fd9\u4f7f\u5f97\u653b\u51fb\u8005\u53ef\u4ee5\u4e3a\u8f93\u5165\u4e2d\u7684\u6bcf\u4e2a\u5f15\u53f7\u7834\u574f\u4e00\u4e2a\u5b57\u8282\u7684\u5185\u5b58\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\u6ca1\u6709\u8be6\u7ec6\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\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\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2021-16935\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "GNU GRUB2 \u003c2.06"
  },
  "referenceLink": "https://packetstormsecurity.com/files/161627/Red-Hat-Security-Advisory-2021-0698-01.html",
  "serverity": "\u9ad8",
  "submitTime": "2021-03-05",
  "title": "grub2\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2021-16935\uff09"
}

CVE-2021-20233 (GCVE-0-2021-20233)

Vulnerability from cvelistv5 – Published: 2021-03-03 16:44 – Updated: 2024-08-03 17:37

Summary

A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity

No CVSS data available.

CWE

CWE-787

Assigner

redhat redhat root

References

4 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1926263	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

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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.
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Action not permitted

CNVD-2021-16935

CVE-2021-20233 (GCVE-0-2021-20233)

Tags

Sightings

Nomenclature

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