RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Following a failed login in the pcsd web UI, the page reloads with the last user name that was entered. Because the user name is not sanitized, it allows a user to inject a script that will then get executed. This can be reproduced by entering the following user name in the login form:

test' name=username><script>alert('hello')</script>

While this would qualify as a cross-site scripting issue, it cannot be used to construct a malicious link that could be sent to an unsuspecting victim.

The expected result is that the user name is properly sanitized, or not returned at all on a failed login.

Created attachment 1127307 [details]
proposed fix 1

Created attachment 1127308 [details]
proposed fix 2

Test:

enter the following text to the login form and submit it:
test' name=username><script>alert('hello')</script>

This bug was accidentally moved from POST to MODIFIED via an error in automation, please see mmccune with any questions

Before fix:
[vm-rhel72-1 ~] $ rpm -q pcs
pcs-0.9.143-15.el7.x86_64

1 Open pcs web ui
2 enter the following text to the login form and submit it:
test' name=username><script>alert('hello')</script>
3 alert box apears

After Fix:
[vm-rhel72-1 ~] $ rpm -q pcs
pcs-0.9.151-1.el7.x86_64

1 Open pcs web ui
2 enter the following text to the login form and submit it:
test' name=username><script>alert('hello')</script>
3 alert box does not apear

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2596.html