CVE-2010-4020

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

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 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
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 6 (krb5) RHSA-2010:0925 2010-11-30

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 krb5 Not affected

Acknowledgements

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

Last Modified

CVE description copyright © 2017, The MITRE Corporation

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