69608 : MIT Kerberos 5 (krb5) RC4 Key-derivation Checksums One-byte Stream-cipher Operation Signature Forgery Issue
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
10	1336	over 2 years ago	over 2 years ago	4 times	100%

Timeline

Disclosure Date
2010-11-30

Description

MIT Kerberos 5 (krb5) does not properly reject RC4 key-derivation checksums. The issue is triggered when a remote, authenticated attacker forges an 'AD-SIGNEDPATH' or 'AD-KDC-ISSUED' signature through vulnerabilities in certain certain one-byte stream-cipher operations. This may allow an attacker to gain elevated privileges.

Classification

Location: Remote / Network Access
Attack Type: Cryptographic
Impact: Loss of Integrity
Solution: Patch / RCS
Exploit: Exploit Unknown
Disclosure: Vendor Verified
OSVDB: Authentication Required

Solution

Currently, there are no known workarounds or upgrades to correct this issue. However, MIT has released a patch to address this vulnerability. Check the vendor advisory or solution in the references section.

Products

MIT	Kerberos 5	1.8
		1.8.1
		1.8.2
		1.8.3

References

CVE ID: 2010-4020 (see also: NVD)
Secunia Advisory ID: 42396 42399 42420 42436 42558 42746 43814 44391 47658
Related OSVDB ID: 69607 69609 69610
Vendor Specific News/Changelog Entry: http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
http://www.gentoo.org/security/en/glsa/glsa-201201-13.xml
Mail List Post: http://seclists.org/bugtraq/2010/Nov/229
Vendor Specific Advisory URL: http://support.apple.com/kb/HT1222
http://support.apple.com/kb/HT4581
http://www.debian.org/security/2010/dsa-2129
http://www.ubuntu.com/usn/usn-1030-1
https://rhn.redhat.com/errata/RHSA-2010-0925.html
https://rhn.redhat.com/errata/RHSA-2010-0926.html
News Article: http://www.scmagazineus.com/apple-issues-slew-of-patches/article/198899/
Other Advisory URL: http://www.vmware.com/security/advisories/VMSA-2011-0007.html

Credit

Not Available

CVSSv2 Score

CVSSv2 Base Score = 3.5
Source: nvd.nist.gov | Generated: 2010-12-02 | Disagree?

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