cnvd-2021-16935
Vulnerability from cnvd
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
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。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://packetstormsecurity.com/files/161627/Red-Hat-Security-Advisory-2021-0698-01.html
Impacted products
Name
GNU GRUB2 <2.06
Show details on source website

To clipboard 

{
  "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"
}


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