Improper Input Validation Affecting rsyslog-module-gtls package, versions <8.33.1-3.22.4


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.81% (83rd percentile)

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  • Snyk IDSNYK-SLES151-RSYSLOGMODULEGTLS-2726452
  • published14 Apr 2022
  • disclosed8 Nov 2019

Introduced: 8 Nov 2019

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

How to fix?

Upgrade SLES:15.1 rsyslog-module-gtls to version 8.33.1-3.22.4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rsyslog-module-gtls package and not the rsyslog-module-gtls package as distributed by SLES. See How to fix? for SLES:15.1 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