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I. Basic Information for CVE-2021-41186
Vulnerability Information

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Vulnerability Title
ReDoS vulnerability in parser_apache2
Source: NVD (National Vulnerability Database)
Vulnerability 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 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).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Fluentd 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluentd是云原生计算(Cloud Native Computing Foundation)基金会的一个开源日志收集器。用于从各种数据源收集事件并将它们写入文件、Rdbms、NoSql、IaaS、SaaS、Hadoop 等。 Fluentd v0.14.14到v1.14.1版本存在资源管理错误漏洞,该漏洞源于软件的插件parser_apache2插件对于正则表达式处理存在问题,具有特定字符串模式的受损apache日志可能会导致正则表达式处理时间过长,从而导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
fluentfluentd >= 0.14.14, < 1.14.2 -
II. Public POCs for CVE-2021-41186
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III. Intelligence Information for CVE-2021-41186
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