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Kerberos V5 setuid Security Issue
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Secunia Advisory:
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SA21402
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Release Date:
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2006-08-09
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Last Update:
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2006-08-18
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | Kerberos 5.x
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| | CVE reference: | CVE-2006-3083 (Secunia mirror)
CVE-2006-3084 (Secunia mirror)
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Description:
A security issue has been reported in Kerberos, which potentially can be exploited by malicious, local users to perform certain actions with escalated privileges.
The security issue is caused due to missing checks for whether the "setuid()" call has succeeded in the bundled krshd and v4rcp applications. This can be exploited to disclose or manipulate the contents of arbitrary files or execute arbitrary code with root privileges if the "setuid()" call fails due to e.g. resource limits.
NOTE: This is currently only known to affect the Linux and AIX operating systems.
It has also been reported that similar missing checks exists for the "seteuid()" call in some bundled applications. However, this is currently not known to affect any operating systems.
The security issue has been reported in versions 1.5 and prior.
Solution:
Apply patches. Note that the previous patches (revision 18419 in the diff header) introduced a new bug. Updated patches have been released to correct this problem.
Kerberos V5 1.5:
http://web.mit.edu/kerberos/advisories/2006-001-patch_1.5.txt
Kerberos V5 1.4.3:
http://web.mit.edu/kerberos/advisories/2006-001-patch_1.4.3.txt
Fixes will also be included in the upcoming 1.5.1 and 1.4.4 versions.
Provided and/or discovered by:
The vendor credits Michael Calmer and Marcus Meissner, SUSE.
Changelog:
2006-08-16: Added US-CERT reference.
2006-08-18: Added information about updated patches.
Original Advisory:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2006-001-setuid.txt
Other References:
US-CERT VU#401660:
http://www.kb.cert.org/vuls/id/401660
US-CERT VU#580124:
http://www.kb.cert.org/vuls/id/580124
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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1. Kerberos Multiple Vulnerabilities
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2. Kerberos Multiple Vulnerabilities
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4. Kerberos Multiple Vulnerabilities
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5. Kerberos kadmind xprt->xp_auth Code Execution Vulnerability
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6. Kerberos kadmind "mechglue" Code Execution Vulnerability
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7. Kerberos V5 Multiple Vulnerabilities
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8. Kerberos V5 Telnet Client Information Disclosure Weakness
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9. MIT Kerberos Telnet Client Buffer Overflow Vulnerabilities
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10. Kerberos V5 "libkadm5srv" Buffer Overflow Vulnerability
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