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List:       oss-security
Subject:    Re: [oss-security] CVE request: xpdf
From:       Josh Bressers <bressers () redhat ! com>
Date:       2011-01-24 18:32:11
Message-ID: 546398682.102388.1295893931536.JavaMail.root () zmail01 ! collab ! prod ! int ! phx2 ! redhat ! com
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----- Original Message -----
> I identified two issues in xpdf. I don't think the first requires a
> CVE, since it's incredibly unlikely to be exploitable, but I include
> it here in case someone disagrees.
> 
> 1. Due to an integer overflow when parsing CharCodes for fonts and a
> failure to check the return value of a memory allocation, it is
> possible to trigger writes to a narrow range of offsets from a NULL
> pointer. The chance of being able to exploit this for anything other
> than a crash is very remote: on x86 32-bit, there's no chance (since
> the write occurs between 0xffffffc4 and 0xfffffffc). At least the
> write lands in valid userspace on x86-64, but in my testing this
> memory is never mapped. Fixed in poppler commit at [1], hopefully
> fixed soon at xpdf upstream.

I'm going to give this an ID. Better safe than sorry.
CVE-2010-4653

> 
> 2. Malformed commands may cause corruption of the internal stack used
> to maintain graphics contexts, leading to potentially exploitable
> memory corruption. Fixed in poppler commit at [2], hopefully fixed
> soon at xpdf upstream.
> 

CVE-2010-4654


> [1]
> http://cgit.freedesktop.org/poppler/poppler/commit/?id=cad66a7d25abdb6aa15f3aa94a35737b119b2659
> [2]
> http://cgit.freedesktop.org/poppler/poppler/commit/?id=8284008aa8230a92ba08d547864353d3290e9bf9


Thanks.

-- 
    JB
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