|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.
This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 3, 4 and 5.
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Red Hat security errata
|Red Hat Enterprise Linux version 6 (krb5)||RHSA-2010:0925||November 30, 2010|
Red Hat would like to thank the MIT Kerberos Team for reporting this issue.
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