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[ GLSA 200903-39 ] pam_krb5: Privilege escalation
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PostPosted: Wed Mar 25, 2009 11:26 pm    Post subject: [ GLSA 200903-39 ] pam_krb5: Privilege escalation Reply with quote

Gentoo Linux Security Advisory

Title: pam_krb5: Privilege escalation (GLSA 200903-39)
Severity: high
Exploitable: local
Date: March 25, 2009
Bug(s): #257075
ID: 200903-39

Synopsis

Two vulnerabilities in pam_krb5 might allow local users to elevate their privileges or overwrite arbitrary files.

Background

pam_krb5 is a a Kerberos v5 PAM module.

Affected Packages

Package: sys-auth/pam_krb5
Vulnerable: < 3.12
Unaffected: >= 3.12
Architectures: All supported architectures


Description

The following vulnerabilities were discovered:
  • pam_krb5 does not properly initialize the Kerberos libraries for setuid use (CVE-2009-0360).
  • Derek Chan reported that calls to pam_setcred() are not properly handled when running setuid (CVE-2009-0361).


Impact

A local attacker could set an environment variable to point to a specially crafted Kerberos configuration file and launch a PAM-based setuid application to elevate privileges, or change ownership and overwrite arbitrary files.

Workaround

There is no known workaround at this time.

Resolution

All pam_krb5 users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-auth/pam_krb5-3.12"


References

CVE-2009-0360
CVE-2009-0361
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