Improper Input Validation Affecting rsyslog-pgsql package, versions <0:8.24.0-52.amzn2


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

Exploit Maturity
Not Defined
EPSS
0.95% (84th percentile)

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  • Snyk IDSNYK-AMZN2-RSYSLOGPGSQL-1680962
  • published27 Sept 2021
  • disclosed7 Oct 2019

Introduced: 7 Oct 2019

CVE-2019-17042  (opens in a new tab)
CWE-20  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 rsyslog-pgsql to version 0:8.24.0-52.amzn2 or higher.
This issue was patched in ALAS2-2020-1447.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rsyslog-pgsql package and not the rsyslog-pgsql package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

An issue was discovered in Rsyslog v8.1908.0. contrib/pmcisconames/pmcisconames.c has a heap overflow in the parser for Cisco log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon), but fails to account for strings that do not satisfy this constraint. If the string does not match, then the variable lenMsg will reach the value zero and will skip the sanity check that detects invalid log messages. The message will then be considered valid, and the parser will eat up the nonexistent colon delimiter. In doing so, it will decrement lenMsg, a signed integer, whose value was zero and now becomes minus one. The following step in the parser is to shift left the contents of the message. To do this, it will call memmove with the right pointers to the target and destination strings, but the lenMsg will now be interpreted as a huge value, causing a heap overflow.

CVSS Scores

version 3.1