Pavel Kankovsky has reported a weakness in the Linux kernel, which can be exploited by malicious, local users to disclose potentially sensitive information.
The weakness is caused due to the "sockaddr_in.sin_zero" array not being zeroed before being returned to user space programs calling certain socket functions to retrieve information about the specified socket. This can be exploited to disclose six uninitialised bytes of the kernel stack via calls to the "getsockopt()" function with the "SO_ORIGINAL_DST" option, or via calls to the "getsockname()", "getpeername()", and "accept()" functions.
The weakness has been reported in the 2.4 and 2.6 kernel branches.
NOTE: The weakness in the "getsockname()", "getpeername()", and "accept()" functions affect only the 2.4 kernel.
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Subject: Linux Kernel IPv4 "sockaddr_in.sin_zero" Information Disclosure
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