oss-security - Re: CVE-2009-2698 kernel: udp socket NULL ptr dereference

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Message-ID: <4A9A5F56.4000508@kernel.sg>
Date: Sun, 30 Aug 2009 19:15:34 +0800
From: Eugene Teo <eugeneteo@...nel.sg>
To: oss-security@...ts.openwall.com
CC: Greg KH <gregkh@...e.de>
Subject: Re: CVE-2009-2698 kernel: udp socket NULL ptr dereference

Eugene Teo wrote:
> A flaw was found in the udp_sendmsg() implementation in the Linux kernel 
> when using the MSG_MORE flag on UDP sockets. A local, unprivileged user 
> could use this flaw to cause a local denial of service or escalate their 
> privileges. This was fixed by Herbert Xu in v2.6.19-rc1, and reported by 
> Tavis Ormandy and Julien Tinnes of the Google Security Team.
> 
> Upstream commits:
> http://git.kernel.org/linus/1e0c14f49d6b393179f423abbac47f85618d3d46
> 
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2698
> https://rhn.redhat.com/errata/RHSA-2009-1222.html
> https://rhn.redhat.com/errata/RHSA-2009-1223.html

Related to this:
Add a check in ip_append_data() for NULL *rtp to prevent future bugs in 
callers from being exploitable.
http://git.kernel.org/linus/788d908f2879a17e5f80924f3da2e23f1034482d

Thanks, Eugene

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