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Insecure Library Loading
Moderately critical

rsyslog Two Vulnerabilities

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Release Date:  2011-09-02    Last Update:  2011-12-23    Views:  3,007

Secunia Advisory SA45848

Where:

From local network

Impact:

DoS, System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


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.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Reported in a Red Hat bug.
2) Reported in a rsyslog bug by Peter Eisentraut.

Original Advisory:
rsyslog:
http://www.rsyslog.com/potential-dos-with-malformed-tag/

rsyslog bug #221:
http://bugzilla.adiscon.com/show_bug.cgi?id=221

Red Hat bug 727644:
https://bugzilla.redhat.com/show_bug.cgi?id=727644

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: rsyslog Two Vulnerabilities

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