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Kerberos Multiple Vulnerabilities
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Secunia Advisory:
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SA26676
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Release Date:
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2007-09-05
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Last Update:
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2007-09-13
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Popularity:
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7,999 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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Binary Analysis:
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BA230 :: Available for 1 Credit 
BA231 :: Available for 1 Credit
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| CVE reference: | CVE-2007-3999
CVE-2007-4000
CVE-2007-4743
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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) A boundary error within the implementation of the RPCSEC_GSS authentication type exists in the "svcauth_gss_validate()" function in src/lib/rpc/svc_auth_gss.c. This can be exploited to cause a stack-based buffer overflow by sending a specially crafted RPC message to a vulnerable server.
Successful exploitation potentially allows the execution of arbitrary code. Products linking to the RPC library may also be affected.
2) The "kadm5_modify_policy_internal()" function in src/lib/kadm5/srv/svr_policy.c does not correctly check return values of the "krb5_db_get_policy()" function. This can be exploited to cause a memory corruption and may potentially allow the execution of arbitrary code.
Successful exploitation requires valid user credentials and privileges to modify policies.
Vulnerability #1 is reported in krb5-1.4 through krb5-1.6.2, vulnerability #2 is reported in krb5-1.5 through krb5-1.6.2.
Solution:
Update to Kerberos 1.5.5 or 1.6.3 as soon as available or apply patches.
http://web.mit.edu/kerberos/advisories/2007-006-patch.txt
NOTE: The initial patch was incorrect, allowing a 32-byte overflow. Apply the corrected patch from the same link.
Provided and/or discovered by:
1) Tenable Network Security, reported via the Zero Day Initiative.
2) Garrett Wollman, MIT CSAIL.
Changelog:
2007-09-06: Updated "Solution" section.
2007-09-07: Added CVE reference.
2007-09-13: Added link to ZDI advisory, updated "Credits" section.
Original Advisory:
MIT Kerberos:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-006.txt
ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-07-052.html
Other References:
US-CERT VU#883632:
http://www.kb.cert.org/vuls/id/883632
US-CERT VU#377544:
http://www.kb.cert.org/vuls/id/377544
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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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