This issue affects the versions of libuser as shipped with Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This vulnerability has been rated as having Important security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
CVSS v2 metrics
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Red Hat Security Errata
|Red Hat Enterprise Linux 7 (libuser)||RHSA-2015:1483||2015-07-23|
|Red Hat Enterprise Linux 6 (libuser)||RHSA-2015:1482||2015-07-23|
Affected Packages State
|Red Hat Enterprise Linux 5||libuser||Will not fix|
AcknowledgementsRed Hat would like to thank Qualys for reporting this issue.
Add pam_warn and pam_deny rules to /etc/pam.d/chfn and /etc/pam.d/chsh to prevent non-root users from using this functionality. With these edits, the files should contain:
auth sufficient pam_rootok.so
auth required pam_warn.so
auth required pam_deny.so
auth include system-auth
account include system-auth
password include system-auth
session include system-auth
After these changes, attempts by unprivileged users to use chfn and chsh (and the respective functionality in the userhelper program) will fail, and will be logged (by default in /var/log/secure).