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CVE Database

CVE-2010-4020

Impact: Moderate
Public: 2010-11-30
Bugzilla: 648735: CVE-2010-4020 krb5: krb5 may accept authdata checksums with low-entropy derived keys (MITKRB5-SA-2010-007)
IAVA: 2011-A-0066

Details

The MITRE CVE dictionary describes this issue as:

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Find out more about CVE-2010-4020 from the MITRE CVE dictionary and NIST NVD.

Statement

This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 3, 4 and 5.

CVSS v2 metrics

Base Score: 3.5
Base Metrics: AV:N/AC:M/Au:S/C:N/I:P/A:N
Access Vector: Network
Access Complexity: Medium
Authentication: Single Instance
Confidentiality Impact: None
Integrity Impact: Partial
Availability Impact: None

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat security errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (krb5) RHSA-2010:0925 November 30, 2010

External References

Acknowledgements

Red Hat would like to thank the MIT Kerberos Team for reporting this issue.

This page is generated automatically and has not been checked for errors or omissions.

For clarification or corrections please contact the Red Hat Security Response Team.