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CVE-2019-17041

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2020-1702-01
Posted Apr 28, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1702-01 - The rsyslog packages provide an enhanced, multi-threaded syslog daemon. It supports MySQL, syslog/TCP, RFC 3195, permitted sender lists, filtering on any message part, and fine-grained control over output format. Issues addressed include a heap overflow vulnerability.

tags | advisory, overflow, tcp
systems | linux, redhat
advisories | CVE-2019-17041, CVE-2019-17042
SHA-256 | 8f2c142f2755284356d752a2a9083db5906f1c101b0473922a4651d6c653e11b
Download | Favorite | View
Red Hat Security Advisory 2020-1000-01
Posted Mar 31, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1000-01 - The rsyslog packages provide an enhanced, multi-threaded syslog daemon. It supports MySQL, syslog/TCP, RFC 3195, permitted sender lists, filtering on any message part, and fine-grained control over output format. A heap-based overflow was addressed.

tags | advisory, overflow, tcp
systems | linux, redhat
advisories | CVE-2019-17041, CVE-2019-17042
SHA-256 | a05f2d02c4e050654376794065fcd0c944afaa09edf293301111c78112a800ec
Download | Favorite | View
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