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AUSCERT External Security Bulletin Redistribution
ESB-2006.0574 -- [UNIX/Linux]
Heimdal Kerberos also affected by privilege escalation vulnerabilities
11 August 2006
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AusCERT Security Bulletin Summary
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Product: Heimdal Kerberos 0.7.2 and prior
Publisher: Heimdal
Operating System: UNIX variants (UNIX, Linux)
Impact: Root Compromise
Overwrite Arbitrary Files
Access: Existing Account
CVE Names: CVE-2006-3084 CVE-2006-3083
Ref: ESB-2006.0565
Original Bulletin: http://www.pdc.kth.se/heimdal/advisory/2006-08-08/
Comment: The recent vulnerabilities reported in AusCERT ESB-2006.0565
for MIT Kerberos also affect Heimdal. This vulnerability may
or may not affect operating systems other than Linux and AIX,
depending on the implementation of seteuid on the specific
operating system.
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2006-08-08: multiple local privilege escalation vulnerabilities
This problem applies to systems where setuid/seteuid call call fail due to
resource exhaustion. One operating system that is true is Linux. The programs
that this this problem applies to are ftpd and rcp. The problem only apply
to rcp if it installed setuid root (not done by default).
Patch (heimdal-0.7.2-setuid-patch) for Heimdal 0.7.2 fixes this problem.
One workaround is to make sure set{e,}uid doesn't fail. Also disabling ftpd
and removing the setuid bit from rcp will solve the problem.
Thanks to Tom Yu at MIT and Michael Calmer and Marcus Meissner at SUSE for
tell us about the problem. Either of CVE-2006-3083 or CVE-2006-3084 describes
this problems.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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