Two vulnerabilities have been reported in rsyslog, which can be exploited by malicious, local users and malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.
1) An off-by-two error within the "parseLegacySyslogMsg()" function (tools/syslogd.c) and can be exploited to cause a limited stack-based buffer overflow by sending an overly long TAG within a legacy syslog message.
2) A signedness error within the "rsCStrExtendBuf()" function (runtime/stringbuf.c) can be exploited to cause a heap-based buffer overflow via overly long messages.
Vulnerability #1 is reported in versions 4.6.0 through 4.6.7 and versions 5.2.0 through 5.8.4. Vulnerability #2 is reported in versions prior to 4.6.6 and 5.8.0.
Solution: Update to versions 4.6.8 or 5.8.5. Vulnerability #2 is already fixed in versions 4.6.6 and 5.8.0.
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Subject: rsyslog Two Vulnerabilities
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