CVE-2021-41186

描述

Fluentd collects events from various data sources and writes them to files to help unify logging infrastructure. The parser_apache2 plugin in Fluentd v0.14.14 to v1.14.1 suffers from a regular expression denial of service (ReDoS) vulnerability. A broken apache log with a certain pattern of string can spend too much time in a regular expression, resulting in the potential for a DoS attack. This issue is patched in version 1.14.2 There are two workarounds available. Either don't use parser_apache2 for parsing logs (which cannot guarantee generated by Apache), or put patched version of parser_apache2.rb into /etc/fluent/plugin directory (or any other directories specified by the environment variable `FLUENT_PLUGIN` or `--plugin` option of fluentd).

如何修補 CVE-2021-41186

要修補 CVE-2021-41186,請將受影響套件升級到下列已修補版本。

• —升級至 1.14.2 或更新版本

CVE-2021-41186 正在被利用嗎?

低 — EPSS 為 2.0%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 0.14.14, < 1.14.2

CVSS 分數

參考連結(7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-41186
• PATCHgithub.com/fluent/fluentd
• WEBgithub.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
• WEBgithub.com/fluent/fluentd/commit/5482a3d049dab351de0be68f4b4bc562319d8511