CVE-2019-17041
rsyslog - security update
Description
An issue was discovered in Rsyslog v8.1908.0. contrib/pmaixforwardedfrom/pmaixforwardedfrom.c has a heap overflow in the parser for AIX 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.
How to fix CVE-2019-17041
To remediate CVE-2019-17041, upgrade the affected package to a fixed version below.
- —upgrade to 8.1904.0-r1 or later
- —upgrade to 8.1910.0-1 or later
- —upgrade to 8.4.2-1+deb8u3 or later
- —upgrade to 8.24.0-1+deb9u1 or later
Is CVE-2019-17041 being exploited?
Low — EPSS is 1.8%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 8.1904.0-r1
- from 0, < 8.1910.0-1
- from 0, < 8.4.2-1+deb8u3
- from 0, < 8.24.0-1+deb9u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |