BugTraq
Solaris syslogd overflow Jun 04 2003 11:51PM
David Thiel (lx redundancy redundancy org)
Synopsis:

Solaris syslogd is vulnerable to a remote buffer overflow.

Versions:

Solaris 2.6 SPARC: Not vulnerable
Solaris 2.7 SPARC/x86: Untested
Solaris 8 SPARC: Vulnerable
Solaris 8 x86: Vulnerable
Solaris 9 SPARC: Not vulnerable
Solaris 9 x86: Untested

Impact:

Low-Medium.

While I've not been able to craft an exploit that successfully
executes arbitrary code, it may still be possible. If
not, this can be used to hide evidence of attack or intrusion
in environments where a central logging server is used.

Description:

In Solaris 8, syslogd dumps core when receiving a UDP packet
larger than 1024 bytes, instead of truncating it, as dictated
by RFC3164, section 6.1.

Fix:

Sun Microsystems released patch 110945-08 for SPARC and
110946 for x86, which resolves this problem (identified as
bug #4812764) on 2003-05-29. Obviously, any systems not
using syslogd to log from remote hosts should be run with
the -t flag. Alternatively, consider switching to a more
reliable logging system, such as Gerrit Pape's socklog.

Timeline:

2003-01-18: Problem discovered, platforms tested.
2003-01-21: Sun Security Coordination Team notified.
2003-02-04: Sun confirms the problem and assigns bug ID.
2003-05-29: Patch released.

References:

http://sunsolve.sun.com/pub-cgi/findPatch.pl?patchId=110945&rev=08

If anyone else is able to do anything more interesting with this bug,
I'd like to hear about it.

Cheers,
lx

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