Debian DSA-1766-1 : krb5 - several vulnerabilities
Critical Nessus Plugin ID 36120
Synopsis
The remote Debian host is missing a security-related update.
Description
Several vulnerabilities have been found in the MIT reference implementation of Kerberos V5, a system for authenticating users and services on a network. The Common Vulnerabilities and Exposures project identified the following problems :
- CVE-2009-0844 The Apple Product Security team discovered that the SPNEGO GSS-API mechanism suffers of a missing bounds check when reading a network input buffer which results in an invalid read crashing the application or possibly leaking information.
- CVE-2009-0845 Under certain conditions the SPNEGO GSS-API mechanism references a NULL pointer which crashes the application using the library.
- CVE-2009-0847 An incorrect length check inside the ASN.1 decoder of the MIT krb5 implementation allows an unauthenticated remote attacker to crash of the kinit or KDC program.
- CVE-2009-0846 Under certain conditions the the ASN.1 decoder of the MIT krb5 implementation frees an uninitialized pointer which could lead to denial of service and possibly arbitrary code execution.
Solution
Upgrade the krb5 packages.
For the oldstable distribution (etch), this problem has been fixed in version 1.4.4-7etch7.
For the stable distribution (lenny), this problem has been fixed in version 1.6.dfsg.4~beta1-5lenny1.