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Moderate Local Escalation Risk from pam_krb5 in Red Hat Enterprise Linux 5

red hat
Calendar Grey October 2, 2008
Dist Redhat Esm H88
CentOS bulletin on pam_krb5 vulnerability fix mitigating local privilege escalation threats with moderate severity.
An updated pam_krb5 package that fixes a security issue is now available for Red Hat Enterprise Linux 5. This update has been rated as having moderate security impact by the Red ...

Solution

Before applying this update, make sure that all previously-released errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at

Summary

The pam_krb5 module allows Pluggable Authentication Modules (PAM) aware applications to use Kerberos to verify user identities by obtaining user credentials at log in time.
A flaw was found in the pam_krb5 "existing_ticket" configuration option. If a system is configured to use an existing credential cache via the "existing_ticket" option, it may be possible for a local user to gain elevated privileges by using a different, local user's credential cache. (CVE-2008-3825)
Red Hat would like to thank Stéphane Bertin for responsibly disclosing this issue.
Users of pam_krb5 should upgrade to this updated package, which contains a backported patch to resolve this issue.

Topics%20covered

Topics Covered

security advisory local privilege escalation Red Hat Enterprise Linux moderate impact pam_krb5

References

https://www.cve.org/CVERecord?id=CVE-2008-3825 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: pam_krb5-2.2.14-1.el5_2.1.i386.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.i386.rpm
x86_64: pam_krb5-2.2.14-1.el5_2.1.i386.rpm pam_krb5-2.2.14-1.el5_2.1.x86_64.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.i386.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: pam_krb5-2.2.14-1.el5_2.1.i386.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.i386.rpm
ia64: pam_krb5-2.2.14-1.el5_2.1.i386.rpm pam_krb5-2.2.14-1.el5_2.1.ia64.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.i386.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.ia64.rpm
ppc: pam_krb5-2.2.14-1.el5_2.1.ppc.rpm pam_krb5-2.2.14-1.el5_2.1.ppc64.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.ppc.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.ppc64.rpm
s390x: pam_krb5-2.2.14-1.el5_2.1.s390.rpm pam_krb5-2.2.14-1.el5_2.1.s390x.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.s390.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.s390x.rpm
x86_64: pam_krb5-2.2.14-1.el5_2.1.i386.rpm pam_krb5-2.2.14-1.el5_2.1.x86_64.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.i386.rpm pam_krb5-debuginfo-2.2.14-1.el5_2.1.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from

Read the Full Advisory


Advisory ID: RHSA-2008:0907-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2008:0907.html
Issue date: 2008-10-02

Topic

An updated pam_krb5 package that fixes a security issue is now available for Red Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

Topics%20covered

Topics Covered

security advisory local privilege escalation Red Hat Enterprise Linux moderate impact pam_krb5

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Bugs Fixed

461960 - CVE-2008-3825 pam_krb5 existing_ticket permission flaw

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