Date: Fri, 16 Aug 2013 10:22:08 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com, Kurt Seifried <kseifrie@...hat.com> Subject: Re: CVE Request: linux-kernel priviledge escalation on ARM/perf -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 08/16/2013 05:07 AM, Petr Matousek wrote: > On Wed, Aug 14, 2013 at 05:37:32PM -0400, Vince Weaver wrote: >> Hello >> >> I'm not really a security researcher, so hopefully I'm reporting >> this in the proper way. > > Thank you for the report, Vince. I think that it is completely fine > -) > >> I have a fuzzer tool for the perf_event_open() syscall that >> found a few oopses on the ARM platform, which I reported to lkml >> a week ago. >> >> One of the oopses can lead to a local privilege escalation on >> ARM-perf. This fix can be found here: >> http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7809/1 >> >> The discussion thread is: >> https://lkml.org/lkml/2013/8/7/259 >> >> The hope is this appears in 3.11-rc6 but my attempts to get the >> people at security@...r.kernel.org to take this seriously didn't >> really go very well. >> >> I do have code that will exploit the kernel and give me a root >> shell on an ARM Pandaboard machine running 3.11-rc4. The exploit >> is a bit fragile though: + Only works on ARM + Elevates from >> normal user to root, no special config required. perf_event >> syscalls run as regular users, not sure why some think you need >> root. + It does need a user-mappable address at an exact byte >> offset from a pmu_struct in memory. This limits things somewhat; >> in my testing 3.11-rc kernels have INT_MIN at exactly the right >> place but the exploit doesn't work on a 3.7.6 kernel, it just >> oopses or crashes the machine. > > This looks valid to me. Unless someone has any objections, can you > please Kurt assign CVE to this issue? > > Thanks, > Please use CVE-2013-4254 for this issue. - -- Kurt Seifried Red Hat Security Response Team (SRT) PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) iQIcBAEBAgAGBQJSDlGwAAoJEBYNRVNeJnmTUmIQAINcIK8HLi1xR4fbhy87tdSC wv/Ta768n1T/ctooqSocsDt2I0JrT81PG1S8fmKkYziFRG7N7HOMM7vNIvxc9Kzg s3J3nQsOVBHbsVKFX8U1lFnfjJbIBfSJJd4ybmUPi75KiEiH5WJZN8B64gm/14jk h45IOd9rBI6ej5Rk3cOrs3QeLEAJP/KOxbPX+8H0JD4lCNG86oXg8BuPbzqODHXO 9bLtsxetbK8Ago/O9pp5JKClYPCctPjpOJTn7Kz7XeltycGuOHixW2LsH0tP9FUT TxvNalNJ3+JWdUg23C501j1pya6/HPIAIWt0tb7hX6i5PuSluP6/7LfiH7wIySNs Ft0q+FXzd8OUYIw/TiAw1WaRlCb3SNAbNjVDoFcMoaO1KBUXmT3BP8ROgsDO1vZM QEP95sT8yhKDIuNhlK5wbqYMisc9Koo1oOsZLYNcfkMljlB2V+vg6otQdQW/MQMV CPsEMncE3fcRAyabfxVcaQgIDH3WYGbFlMTwNBKyWZjjOX62nGRcNioiVPpQAuNX Evqvt0v8NJDWB2LkoUigp4NzPucQNEifS5ZwCpw14YHD7J7MdgntTVnyFdDGEPMv wC86yJhN/8f1c7TSxVH51P8ZiD5FtHCcz0ynR+9ZeWkcLIHvkyJO4M2NcwAmUOei QoH+aUwRIv/nfky2TdXq =KsT9 -----END PGP SIGNATURE-----
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