Multiple Browser Information Disclosure Vulnerabilities
2005 January 31 20:52 GMT
2006 April 25 17:11 GMT
Mozilla versions prior to 1.7.5, Netscape prior to 8.0 and Thunderbird 0.9 and prior contain vulnerabilities in the browser and the mail client components that could disclose sensitive information to a remote attacker. The attacker may be able to view NTLM or SPNEGO credentials or obtain cookies associated with e-mail.
The first vulnerability (CAN-2005-0147) is due to the way the browser responds to authentication errors. The browser incorrectly responds to any SSL connection instead of just the proxy server. An attacker could send a crafted request that prompts a user for NTLM or SPNEGO credentials. These credentials are then returned to the attacker.
The second vulnerability (CAN-2005-0149) exists when the
browsers receive a HTTP e-mail message. The default setting for the e-mail clients is to block cookie requests; however, the mail clients respond to these requests even under this setting. An attacker could use this to determine whether an e-mail address exists.
Updates are available.
Indicators of Compromise
Systems running Mozilla prior to 1.7.5 or Netscape prior to 8.0 are vulnerable.
The first vulnerability (CAN-2005-0147) exists when the browser responds to a 407 proxy auth request. The browser fails to verify that the request is from the appropriate proxy server. An attacker with a valid SSL connection could obtain the NTLM or SPNEGO credentials with a prompt for the user.
The second vulnerability (CAN-2005-0149) could disclose cookies associated with e-mail. MOZ_MAIL_NEWS contains code to verify whether cookies are from malinews; however, this is not defined in the cpp files. Therefore, the code that would block according to a user's preferences is never run, allowing Mozilla to disclose cookies.
The first vulnerability can disclose NTLM and SPNEGO credentials. The attacker must have a SSL-connected server to exploit this, however, and this may not be easy to achieve from outside the local firewall.
The second vulnerability only allows an attacker to view cookies associated with e-mail, which is not a severe issue when used by itself. However, an attacker could use the e-mail address to relay spam or, with social engineering, attempt to trick a user into visiting a malicious site.
Administrators are advised to apply the appropriate update.
Users may consider configuring the mail client to not accept remote content by using the View as Simple text option.
Users should be careful when supplying login information to a proxy server, and should not authenticate to requests that come unexpectedly.
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM
THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
FIXED SOFTWARE INFORMATION AND LINKS PROVIDED BY SUPPLIERS AND VENDORS ARE FOR REFERENCE ONLY. USERS SHOULD CONTACT THEIR SUPPLIER OR VENDOR FOR UPDATED SOFTWARE.
A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products
Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.