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Kerberos V5 Multiple Vulnerabilities
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Secunia Advisory:
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SA12408
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Release Date:
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2004-09-01
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Last Update:
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2004-09-03
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Popularity:
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14,451 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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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2004-0642
CVE-2004-0643
CVE-2004-0644
CVE-2004-0772
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Description:
Multiple vulnerabilities have been reported in Kerberos V5, where the most serious potentially can be exploited by malicious people to compromise a vulnerable system.
1) Various double-free errors within the KDC (Key Distribution Center) cleanup code and in client libraries may allow unauthenticated people to execute arbitrary code on an affected system. The problem is that the ASN.1 decoding functions may free an allocated buffer on the heap, which may then be freed again later by either the KDC cleanup functionality or certain library functions.
This vulnerability affects version 1.3.4 and prior.
2) Some double-free errors within the "krb5_rd_cred()" function may allow authenticated users to execute arbitrary code on an affected system. The problem is that the function attempts to free an allocated buffer on the heap, which has already been freed by the ASN.1 decoding function when an error is encountered.
This can be exploited via affected services calling the vulnerable function (e.g. krshd, klogind, and telnetd).
This vulnerability affects version 1.3.1 and prior.
3) A double-free error within krb524d may allow execution of arbitrary code. The problem is that a buffer allocated on the heap is freed, when conversion of a cross-realm ticket is denied and then later freed again when calling the "krb5_free_ticket()" function.
This vulnerability affects version 1.2.8 through 1.3.4.
4) An error within the ASN.1 decoder when handling indefinite length BER encodings can be exploited by unauthenticated people to cause a vulnerable system to hang in an infinite loop via a specially crafted BER encoding.
This vulnerability affects versions 1.2.2 through 1.3.4.
Solution:
Patches are available (see patch matrix in the original advisories).
Update to version 1.3.5, when it becomes available.
http://web.mit.edu/kerberos/dist/index.html
Provided and/or discovered by:
1) Will Fiveash and Nico Williams
2) Joseph Galbraith and John Hawkinson
3) Marc Horowitz
4) Will Fiveash and Nico Williams
Changelog:
2004-09-02: Added links to US-CERT vulnerability notes.
2004-09-03: Added links to US-CERT vulnerability notes.
Original Advisory:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-002-dblfree.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-003-asn1.txt
Other References:
US-CERT VU#795632:
http://www.kb.cert.org/vuls/id/795632
US-CERT VU#866472:
http://www.kb.cert.org/vuls/id/866472
US-CERT VU#550464:
http://www.kb.cert.org/vuls/id/550464
US-CERT VU#350792:
http://www.kb.cert.org/vuls/id/350792
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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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