Date: October 20, 2004 Vendor: America Online Inc. Product/Service: America Online Webmail Issue: Cross Site Scripting Vulnerability In Webmail URL: http://webmail.aol.com | AOL Keyword: webmail Advisory URL: http://www.lovebug.org/aolwebmail_advisory.txt Note: While I found these vulnerabilities independently, all credit goes to iDefense as upon searching I found that this scripting error has previously been mentioned (sometime ago at that) in a white paper written by iDefense. This white paper is available at: http://www.cgisecurity.com/lib/XSS.pdf - However, it appears it is possible the vendor has never been notified and that this is not a widely published vulnerability. Since this affects the largest ISP in the world, it might be worth publishing on a larger scale. Service Overview: America Online (AOL) is the world's largest Internet Service Provider. They provide many special online services and features that are only available to its dialup and high speed add-on subscribers. AOL owns many other companies to include Netscape, which also contains the same scripting error in its webmail client. Exploitation: A user can craft a URL that when viewed will conduct a Cross Site Scripting attack. One impact of this attack is that it can give the attacker access to the users cookies. The flaw lies within msglist.adp?folder= An example url is as follows: http://webmail.aol.com/msglist.adp?folder= Note: A user MUST be logged into webmail for this attack to work. Also, AOL's webmail is only accessible to subscribers of the AOL service. Please read the Netscape Webmail advisory to see the differences and who is affected by that vulnerability. Solutions: The script could simply filter and replace special characters or validate user input so scripts cannot be executed. Vendor Response: All previous attempts to alert this vendor to other vulnerabilties, exploits, and holes have proven to be futile. This error has not been reported to the vendor for that reason. If this vendor would like to be notified of future bugs (which there already are) in order to work on a solution prior to disclosure, they can contact me at: steven@lovebug.org Credits: iDefense - and credits go to Link Linkovich for also mentioning and describing problems with Groups@AOL --------------------------- Questions/Comments/Other? Drop me a line. Go Hokies! :D -Steven steven@lovebug.org _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html