Apache HTTP Server Path Traversal Vulnerability

緊急 9.8悪用確認済み（CISA KEV）CVE-2021-41773 · 05/10/2021 公開 · 17/06/2026 更新

Apache HTTP Server Path Traversal Vulnerability. 悪用が確認されています：CISA は 03/11/2021 にこの脆弱性を「既知の悪用された脆弱性（KEV）」カタログに追加しました。影響を受けるシステムは緊急に修正してください。ランサムウェア攻撃での使用が確認されています。

要点

CVE-2021-41773 は http server (apache), instantis enterprisetrack (oracle) に影響する深刻度「緊急」 (CVSS 9.8) の脆弱性です。
実際に悪用されています：CISA が 03/11/2021 に KEV カタログへ追加しました。
今後30日間に悪用される確率（EPSS）：100.0%（全脆弱性の 100.0% より高い）。
修正版の情報はまだありません。参考情報のベンダー勧告を確認してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
http server apache	`= 2.4.49`	修正版なし
instantis enterprisetrack oracle	`= 17.1= 17.2= 17.3`	修正版なし

概要

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.

参考情報

packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html · Exploit
packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html · Exploit
packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html · Exploit
packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html · Exploit
openwall.com/lists/oss-security/2021/10/05/2 · Mailing List
openwall.com/lists/oss-security/2021/10/07/1 · Mailing List
openwall.com/lists/oss-security/2021/10/07/6 · Mailing List
openwall.com/lists/oss-security/2021/10/08/1 · Exploit
openwall.com/lists/oss-security/2021/10/08/2 · Mailing List
openwall.com/lists/oss-security/2021/10/08/3 · Exploit
openwall.com/lists/oss-security/2021/10/08/4 · Mailing List
openwall.com/lists/oss-security/2021/10/08/5 · Mailing List
openwall.com/lists/oss-security/2021/10/08/6 · Mailing List
openwall.com/lists/oss-security/2021/10/09/1 · Mailing List
openwall.com/lists/oss-security/2021/10/11/4 · Mailing List
openwall.com/lists/oss-security/2021/10/15/3 · Mailing List
openwall.com/lists/oss-security/2021/10/16/1 · Mailing List
httpd.apache.org/security/vulnerabilities_24.html · Release Notes
lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E · Mailing List
lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E · Mailing List
lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E · Mailing List
lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E · Mailing List
lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E · Mailing List
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC · Release Notes
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3 · Release Notes
security.gentoo.org/glsa/202208-20 · Third Party Advisory
security.netapp.com/advisory/ntap-20211029-0009 · Third Party Advisory
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ · Third Party Advisory
oracle.com/security-alerts/cpujan2022.html · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-41773

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