A weakness and a vulnerability have been reported in w3m, which can be exploited by malicious people to gain access to potentially sensitive information and conduct spoofing attacks.
1) The vulnerability is caused due to an error when processing SSL certificates containing NULL ('\0') characters embedded in certain certificate fields and can be exploited to spoof certificates for legitimate domains.
2) The weakness is caused due to the application sending the "Referer" HTTP header to HTTP sites when coming from HTTPS sites, which can be exploited to disclose potentially sensitive information contained in the HTTPS URL by reading the "Referer" header.
The weakness and the vulnerability are reported in version 0.5.2. Other versions may also be affected.
Solution: Update to version 0.5.3.
Provided and/or discovered by: 1) Originally independently discovered by Dan Kaminsky and Moxie Marlinspike. Reported in w3m by Ludwig Nussel, SUSE.
Original Advisory: 1) http://www.openwall.com/lists/oss-security/2010/06/14/4
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Subject: w3m "Referer" Weakness and SSL Certificate Processing Vulnerability
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