69608 : MIT Kerberos 5 (krb5) RC4 Key-derivation Checksums One-byte Stream-cipher Operation Signature Forgery Issue
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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

Credit

CVSSv2 Score

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

Access_vector_2 Access_complexity_1 Authentication_1 Confidentiality_impact_0 Integrity_impact_1 Availability_impact_0

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