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Date: Wed, 15 Apr 2015 15:14:33 -0700
From: Tavis Ormandy <>
Subject: Re: Re: Problems in automatic crash analysis frameworks

On Wed, Apr 15, 2015 at 1:44 PM, Tavis Ormandy <> wrote:
> On Wed, Apr 15, 2015 at 2:45 AM, Jakub Filak <> wrote:
>> 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.
>>>        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.
> My description was incorrect, It can't be an arbitrary file, just a
> file you have execute but not read permission.
> Tavis.

Apparently I'm wrong again, spender points out it may still be possible.


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