USN-1030-1: Kerberos vulnerabilities
Ubuntu Security Notice USN-1030-1
9th December, 2010
krb5 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 9.10
- Ubuntu 8.04 LTS
- Ubuntu 6.06 LTS
Software description
- krb5
Details
It was discovered that Kerberos did not properly determine the
acceptability of certain checksums. A remote attacker could use certain
checksums to alter the prompt message, modify a response to a Key
Distribution Center (KDC) or forge a KRB-SAFE message. (CVE-2010-1323)
It was discovered that Kerberos did not properly determine the
acceptability of certain checksums. A remote attacker could use certain
checksums to forge GSS tokens or gain privileges. This issue only affected
Ubuntu 9.10, 10.04 LTS and 10.10. (CVE-2010-1324)
It was discovered that Kerberos did not reject RC4 key-derivation
checksums. An authenticated remote user could use this issue to forge
AD-SIGNEDPATH or AD-KDC-ISSUED signatures and possibly gain privileges.
This issue only affected Ubuntu 10.04 LTS and 10.10. (CVE-2010-4020)
It was discovered that Kerberos did not properly restrict the use of TGT
credentials for armoring TGS requests. A remote authenticated user could
use this flaw to impersonate a client. This issue only affected Ubuntu
9.10. (CVE-2010-4021)
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 10.10:
- libkrb5-3 1.8.1+dfsg-5ubuntu0.2
- Ubuntu 10.04 LTS:
- libkrb5-3 1.8.1+dfsg-2ubuntu0.4
- Ubuntu 9.10:
- libkrb5-3 1.7dfsg~beta3-1ubuntu0.7
- Ubuntu 8.04 LTS:
- libkrb53 1.6.dfsg.3~beta1-2ubuntu1.6
- Ubuntu 6.06 LTS:
- libkrb53 1.4.3-5ubuntu0.12
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.