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Kerberos V5 Multiple Vulnerabilities
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Secunia Advisory:
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SA16041
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Release Date:
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2005-07-13
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Last Update:
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2005-07-14
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Popularity:
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15,581 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 Patch
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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-2005-1174
CVE-2005-1175
CVE-2005-1689
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Description:
Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise a vulnerable system.
1) A double-free error in the "krb5_recvauth()" function can potentially be exploited to execute arbitrary code in the context of the program calling this function.
Successful exploitation may lead to the compromise of an entire Kerberos realm or cause the program to crash.
The vulnerability has been reported in kpropd, klogind, and krshd versions 1.4.1 and prior. Any third-party programs calling the "krb5_recvauth()" function are also vulnerable.
2) An error in the Key Distribution Center (KDC) implementation causes the freeing of memory at random locations, which leads to heap corruption via a specially crafted TCP request.
Successful exploitation crashes the KDC.
The vulnerability has been reported in KDC implementations versions 1.4.1 and prior.
3) A boundary error in the KDC can cause a single-byte heap-based buffer overflow via a specially crafted TCP or UDP request. This can potentially be exploited to execute arbitrary code.
Successful exploitation may lead to the compromise of an entire Kerberos realm or cause a DoS.
The vulnerability has been reported in KDC implementations and application servers versions 1.4.1 and prior. Third-party application servers using MIT krb5 are also affected.
Solution:
Apply patches:
http://web.mit.edu/kerberos/advisories/2005-003-patch_1.4.1.txt
http://web.mit.edu/kerberos/advisories/2005-002-patch_1.4.1.txt
The vulnerabilities will also be fixed in version 1.4.2.
Provided and/or discovered by:
1) The vendor credits Magnus Hagander.
2, 3) The vendor credits Daniel Wachdorf.
Changelog:
2005-07-14: Added links to US-CERT vulnerability notes.
Original Advisory:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-003-recvauth.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-002-kdc.txt
Other References:
US-CERT VU#885830:
http://www.kb.cert.org/vuls/id/885830
US-CERT VU#623332:
http://www.kb.cert.org/vuls/id/623332
US-CERT VU#259798:
http://www.kb.cert.org/vuls/id/259798
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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.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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10th Oct, 2008
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