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Cause:
User enters username containing HTML code to login page and submits the login form.
Consequence:
Login page reloads showing an error message informing about unsuccessful login. HTML code in username is interpreted as part of the page.
Fix:
Properly sanitize username when rendering it in login page.
Result:
Username cannot be used for HTML injection anymore.
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.
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
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.