A security issue and two vulnerabilities have been reported in Opera, which can be exploited by malicious, local users to perform certain actions with escalated privileges and by malicious people to conduct spoofing attacks and potentially compromise a user's system.
1) An error when decoding image data can be exploited to cause a heap-based buffer underflow via a specially crafted GIF image.
Successful exploitation of this vulnerability may allow execution of arbitrary code.
2) An error when loading a site can be exploited to display arbitrary content while showing the URL of a trusted web site in the address bar when a user follows a specially crafted link.
3) The security issue is caused due to the application setting insecure file system permissions on the profile folder, which can be exploited to overwrite the files and execute certain commands.
This security issue affects Opera for Linux/Unix only.
The security issue and the vulnerabilities are reported in versions prior to 12.12.
Solution: Update to version 12.12.
Provided and/or discovered by: 1) Kaveh Ghaemmaghami
2) The vendor credits Masato Kinugawa
3) The vendor credits Jann Horn
Original Advisory: Opera:
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RE: Opera GIF Image Handling Buffer Underflow Vulnerability
7th Dec, 2012 15:02
Score: 7 Posts: 4 User Since: 11th Jan 2008 System Score: N/A Location: IT Last edited on 7th Dec, 2012 15:02
Uhm, I suppose someone in Neohapsis\Secunia has checked this bug (and\or the reputation of Kaveh Ghaemmagham, isn't it?) so could you tell me how you do you control esi? Uhm, I'm wrong so I'll wait for a Metasploit module which take advantage of this vulnerability, see you soon...