Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rsyslog | Rsyslog | 8.1908.0 |
| Fedoraproject | Fedora | 30 |
| Debian | Debian Linux | 9.0 |
| Opensuse | Leap | 15.0 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00031.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00032.htmlMailing ListThird Party Advisory
- https://github.com/rsyslog/rsyslog/blob/v8-stable/ChangeLogRelease NotesThird Party Advisory
- https://github.com/rsyslog/rsyslog/pull/3883PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00030.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00031.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00032.htmlMailing ListThird Party Advisory
- https://github.com/rsyslog/rsyslog/blob/v8-stable/ChangeLogRelease NotesThird Party Advisory
- https://github.com/rsyslog/rsyslog/pull/3883PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00030.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2019-17042?
CVE-2019-17042 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...
How severe is CVE-2019-17042?
CVE-2019-17042 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2019-17042?
Check the references section above for vendor advisories and patch information. Affected products include: Rsyslog Rsyslog, Fedoraproject Fedora, Debian Debian Linux, Opensuse Leap.