CVE-2021-41773
Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49
描述
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.
如何修補 CVE-2021-41773
要修補 CVE-2021-41773,請將受影響套件升級到下列已修補版本。
- —升級至 2.4.50-r0 或更新版本
- —升級至 2.4.50 或更新版本
- —升級至 2.4.50-1 或更新版本
CVE-2021-41773 正在被利用嗎?
是 — CVE-2021-41773 已列入 CISA Known Exploited Vulnerabilities (KEV) 清單,代表正在被實際利用,請立即修補。
受影響套件(3)
- from 0, < 2.4.50-r0
- >= 2.4.49, < 2.4.50
- from 0, < 2.4.50-1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
參考連結(33)
- ADVISORYsecurity.alpinelinux.org/vuln/CVE-2021-41773
- ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-41773
- WEBpacketstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html
- WEBpacketstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html