要点
- CVE-2021-41186 は fluentd, fluentd (fluentd) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：2.2%（全脆弱性の 82.6% より高い）。
- 対処：1.14.2 以降に更新してください。
| 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 |
|---|
| fluentd RubyGems | ≥ 0.14.14, < 1.14.2
| 1.14.2
|
| fluentd | ≥ 0.14.14, ≤ 1.14.1
| 修正版なし |
概要
Impact
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.
Patches
v1.14.2
Workarounds
Either of the following:
- Don't use parser_apache2 for parsing logs which cannot guarantee generated by Apache.
- 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).
References
NVD の説明
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).
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