CVE-2021-41186 — Uncontrolled Resource Consumption in Fluentd

CWE-400 — Uncontrolled Resource Consumption5 documents5 sources
Severity
7.5HIGHNVD
EPSS
0.5%
top 34.58%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
FluentdFluent FluentdMsrc CM1 Rubygem-fluentd 1.11.0-1 ON CBL Mariner 1.0
Timeline
PublishedOct 29
Latest updateNov 1

Description

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…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶RubyGemsfluentd/fluentd0.14.14 — 1.14.2
▶NVDfluentd/fluentd0.14.14 — 1.14.1
▶CVEListV5fluent/fluentd>= 0.14.14, < 1.14.2

🔴Vulnerability Details

2
GHSA
ReDoS vulnerability in parser_apache2↗2021-11-01
▶
OSV
ReDoS vulnerability in parser_apache2↗2021-11-01
▶

📋Vendor Advisories

2
Red Hat
fluentd: ReDoS vulnerability in parser_apache2↗2021-10-29
▶
Microsoft
ReDoS vulnerability in parser_apache2↗2021-10-12
▶
CVE-2021-41186 — Uncontrolled Resource Consumption | cvebase