CVE-2020-11008— Git 输入验证错误漏洞
一分钟漏洞结论
影响对象
git git
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Git是一套免费、开源的分布式版本控制系统。 Git中存在输入验证错误漏洞。攻击者可借助特制恶意URL利用该漏洞泄露敏感信息。以下产品及版本受到影响： Git 2.17.4及之前版本，2.18.3及之前版本，2.19.4及之前版本，2.20.3及之前版本，2.21.2及之前版本，2.22.3及之前版本，2.23.2及之前版本，2.24.2及之前版本，2.25.3及之前版本，2.26.1及之前版本。
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一、 漏洞 CVE-2020-11008 基础信息
漏洞信息
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Vulnerability Title
Malicious URLs can still cause Git to send a stored credential to the wrong server
来源: CVE Program / CVE List V5
Vulnerability Description
Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. This bug is similar to CVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix for that bug still left the door open for an exploit where _some_ credential is leaked (but the attacker cannot control which one). Git uses external "credential helper" programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that are considered illegal as of the recently published Git versions can cause Git to send a "blank" pattern to helpers, missing hostname and protocol fields. Many helpers will interpret this as matching _any_ URL, and will return some unspecified stored password, leaking the password to an attacker's server. The vulnerability can be triggered by feeding a malicious URL to `git clone`. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The root of the problem is in Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the vulnerability in practice depends on which helpers are in use. Credential helpers which are known to trigger the vulnerability: - Git's "store" helper - Git's "cache" helper - the "osxkeychain" helper that ships in Git's "contrib" directory Credential helpers which are known to be safe even with vulnerable versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to trigger the vulnerability.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
来源: CVE Program / CVE List V5
Vulnerability Title
Git 输入验证错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Git是一套免费、开源的分布式版本控制系统。 Git中存在输入验证错误漏洞。攻击者可借助特制恶意URL利用该漏洞泄露敏感信息。以下产品及版本受到影响： Git 2.17.4及之前版本，2.18.3及之前版本，2.19.4及之前版本，2.20.3及之前版本，2.21.2及之前版本，2.22.3及之前版本，2.23.2及之前版本，2.24.2及之前版本，2.25.3及之前版本，2.26.1及之前版本。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2020-11008 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2020-11008 补丁与修复 (1)
CVE-2020-11008 厂商安全公告 (5)
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https://github.com/git/git/security/advisories/GHSA-hjc9-x69f-jqj7 x_refsource_CONFIRM
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https://support.apple.com/kb/HT211183 x_refsource_CONFIRM
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CVE-2020-11008 邮件列表归档 (5)
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http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00003.html vendor-advisory x_refsource_SUSE
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/74Q7WVJ6FKLIN62VS2JD2XCNWK5TNKOW/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN3FUOXKX3AXTULYV53ACABER2W2FSOU/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MOCTR2SEHCPSCOVUQJAGFPGKFMI2VE6V/ vendor-advisory x_refsource_FEDORA
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IV. Related Vulnerabilities
V. Comments for CVE-2020-11008
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