CVE-2021-21657

描述

Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows attackers with Job/Configure permission or otherwise able to control the contents of an XML file being polled for changes to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the polling Jenkins controller or agent, server-side request forgery, or denial-of-service attacks. Jenkins Filesystem Trigger Plugin 0.41 disables external entity resolution for its XML parser.

如何修補 CVE-2021-21657

要修補 CVE-2021-21657,請將受影響套件升級到下列已修補版本。

• —升級至 0.41 或更新版本

CVE-2021-21657 正在被利用嗎?

低 — EPSS 為 0.2%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 0.41

CVSS 分數

參考連結(4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21657
• PATCHgithub.com/jenkinsci/fstrigger-plugin
• WEBwww.jenkins.io/security/advisory/2021-05-25/#SECURITY-2339
• WEBwww.openwall.com/lists/oss-security/2021/05/25/3