oss-security - Re: CVE request: kernel (ARM): heap corruption in OABI semtimedop

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Date: Mon, 2 May 2011 14:59:01 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley <coley@...re.org>
Subject: Re: CVE request: kernel (ARM): heap corruption in
 OABI semtimedop



----- Original Message -----
> The OABI wrapper for semtimedop does not bound the nsops argument. A
> sufficiently large value will cause an integer overflow in allocation
> size, followed by copying too much data into the allocated buffer.
> This only affects ARM systems with CONFIG_OABI_COMPAT set.
> 
> This is exploitable for local privilege escalation, but successful
> exploitation requires winning a race. Because user-to-kernel copy
> functions on ARM zero the destination buffer even on failure to access
> the provided user pointer, the copy loop in the vulnerable function
> that causes the overflow will zero out large amounts of kernel heap if
> not interrupted, crashing the system. This should be possible to work
> around though.
> 
> -Dan
> 
> [1] http://marc.info/?l=linux-kernel&m=130408851326428&w=2

Please use CVE-2011-1759.

Thanks.

-- 
    JB

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