Title: Multiple Vendor Kerberos 4 Temporary File Race Condition Vulnerability
Severity: MODERATE
Description:
Kerberos is a widely used network service authentication system. The version of Kerberos developed and maintained by KTH (Swedish Royal Institute of Technology) contains a local /tmp race condition vulnerability. Unfixed versions of MIT Kerberos 4 and 5, Cygnus Network Security (Kerberos 4) and Kerbnet (Kerberos 5) also suffer from an analogous problem in the krb4 library.
The Kerberos system, when creating tickets, uses temporary files in the /tmp directory. The names of these files are reportedly predictable and can be anticipated by attackers. If a symbolic link were to exist in /tmp with a correctly guessed filename when Kerberos is creating tickets, the symbolic link would be followed and whatever it pointed to would be written to. The target file pointed to by the symbolic link would be written to as root.
If a system-critical file were to be overwritten/corrupted, a denial of service may occur.
Affected Products:
- Cygnus Cygnus Network Security 4.0.0.x
- Cygnus KerbNet 5.0.0.x
- KTH Kerberos 4 0.0.00.0
- KTH Kerberos 4 0.1.0
- KTH Kerberos 4 0.10.0
- KTH Kerberos 4 0.10.1
- KTH Kerberos 4 0.5.0
- KTH Kerberos 4 0.6.0
- KTH Kerberos 4 0.7.0
- KTH Kerberos 4 0.8.0
- KTH Kerberos 4 0.9.0
- KTH Kerberos 4 0.9.1
- KTH Kerberos 4 0.9.2
- KTH Kerberos 4 0.9.2a
- KTH Kerberos 4 0.9.3
- KTH Kerberos 4 0.9.5
- KTH Kerberos 4 0.9.6
- KTH Kerberos 4 0.9.6+patches
- KTH Kerberos 4 0.9.7
- KTH Kerberos 4 0.9.8
- KTH Kerberos 4 0.9.9
- KTH Kerberos 4 1.0.0
- KTH Kerberos 4 1.0.0-1.0.1
- KTH Kerberos 4 1.0.1
- KTH Kerberos 4 1.0.1-1
- KTH Kerberos 4 1.0.2
- KTH Kerberos 4 1.0.3
- KTH Kerberos 4 1.0.3-1
- KTH Kerberos 4 1.0.3-1.0
- MIT Kerberos 4 4.0.0
- MIT Kerberos 4 4.0.0 patch 10
- MIT Kerberos 5 1.2.1
- MIT Kerberos 5 5.0.0 -1.0.x
- MIT Kerberos 5 5.0.0 -1.1
- MIT Kerberos 5 5.0.0 -1.1.1
- MIT Kerberos 5 5.0.0 -1.2beta1
- MIT Kerberos 5 5.0.0 -1.2beta2
References:
- MIT: Kerberos Homepage
- Swedish Royal Institute of Technology: KTH Kerberos Homepage
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