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Multiple Vulnerabilities in WebConnect (Directory Traversal, DoS)
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SUMMARY
<http://www.openconnect.com/solutions/webconnect.jsp> WebConnect is
"client-server based software that provides secure browser based
emulation to mainframe, midrange and UNIX systems".
WebConnect has been found to contain a DoS and a directory traversal
vulnerability.
DETAILS
Vulnerable Systems:
* WebConnect version 6.4.4
* WebConnect version 6.5
Immune Systems:
* WebConnect version 6.5.1 or newer
Denial Of Service
When requesting a DOS device (such as LPT1) in the URL the server will
stop responding to any further requests before a manual restart of service
has been made. This attack can be preformed on both the client website and
the administration interface.
Proof-of-concept
http://target:2080/COM1
http://target:2080/COM2
http://target:2080/AUX
http://target:2080/COM1.jsp
http://target:2080/COM1.html
http://target:2080/COM1.smurf
Directory Traversal
The file jretest.html is vulnerable to reading files from outside the
webroot, this seems only possible if the "parms" has to be set to
"default". The problem exists since the service as default runs with
system rights, this could give access to the entire partition that
WebConnect is installed on. This problem shows that the file is not
properly sanitize.
Proof-of-concept:
http://target:2080/jretest.html?lang=&parms=default&WCP_USER=..//..//..//..//..//boot.ini&action=
Disclosure Timeline:
06-12-2004 - Vulnerability discovered
20-12-2004 - Research completed
20-12-2004 - Vendor contacted - Openconnect VEND#662112
06-01-2005 - CERT informed by vendor
18-01-2005 - New version 6.5 - Directory traversal are fixed and
Denial-of-service are still vulnerable to this attack
18-01-2005 - Vendor informed
25-01-2005 - Vendor fixed the vulnerability
10-02-2005 - CERT responded - VU#552561 / CAN-2004-0466 and VU#628411 /
CAN-2004-0465
14-02-2005 - Public Disclosure delayed due to request from vendor
21-02-2005 - Public Disclosure
ADDITIONAL INFORMATION
The information has been provided by <mailto:advisory@cirt.dk> CIRT
Advisory.
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