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Kerberos Multiple Vulnerabilities
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Secunia Advisory:
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SA25800
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Release Date:
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2007-06-27
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Popularity:
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7,731 views
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Critical:
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Highly critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| Software: | Kerberos 5.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2007-2442
CVE-2007-2443
CVE-2007-2798
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Description:
Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious users and malicious people to compromise a vulnerable system.
1) An error exists within the "gssrpc__svcauth_gssapi" function in the RPC library, which can cause kadmind and possibly other third-party products to free an uninitialised pointer when receiving an RPC credential with a length of zero.
2) A signedness error exists within the "gssrpc__svcauth_unix()" function in the RPC library, which is used by kadmind and possibly other third-party products. This can be exploited to cause a stack-based buffer overflow.
Successful exploitation of vulnerability #1 and #2 potentially allows execution of arbitrary code.
3) A boundary error exists in kadmind within the "rename_principal_2_svc()" function and can be exploited to cause a stack-based buffer overflow.
Successful exploitation allows execution of arbitrary code but requires valid user credentials.
The vulnerabilities are reported in krb5-1.6.1. Other versions may also be affected.
Solution:
Apply patches (see vendor advisories for details).
http://web.mit.edu/kerberos/advisories/2007-004-patch.txt
http://web.mit.edu/kerberos/advisories/2007-004-patch.txt.asc
http://web.mit.edu/kerberos/advisories/2007-005-patch.txt
http://web.mit.edu/kerberos/advisories/2007-005-patch.txt.asc
Provided and/or discovered by:
1, 2) The vendor credits Wei Wang, McAfee Avert Labs.
3) An anonymous person, reported via iDefense Labs.
Original Advisory:
Kerberos:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-004.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-005.txt
iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=548
Other References:
US-CERT VU#356961:
http://www.kb.cert.org/vuls/id/356961
US-CERT VU#365313:
http://www.kb.cert.org/vuls/id/365313
US-CERT VU#554257:
http://www.kb.cert.org/vuls/id/554257
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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