Solaris syslogd overflow

[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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