Date: Wed, 15 Apr 2015 05:45:44 -0400 (EDT) From: Jakub Filak <jfilak@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: Problems in automatic crash analysis frameworks Hello, I have a question regarding the ABRT vulnerabilities. I don't particularly understand how an attacker can use /proc/pid/exe symlink to force ABRT to read an arbitrary file if the symlink cannot be changed and kernel refuses to create the process if the symlink's target is not executable. > This code trusts the /proc/pid/exe symlink, even though it is possible > to link it anywhere you want. > > https://github.com/abrt/abrt/blob/master/src/hooks/abrt-hook-ccpp.c#L368 > > sprintf(buf, "/proc/%lu/exe", (long)pid); > int src_fd_binary = open(buf, O_RDONLY); /* might fail and > return -1, it's ok */ Thank you for clarifying this for me. Kind regards, Jakub
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