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Date: Fri, 7 Oct 2011 15:03:57 +0200
From: Robert Święcki <>
Subject: Re: radvd 1.8.2 released with security fixes

On Fri, Oct 7, 2011 at 12:35 PM, Huzaifa Sidhpurwala
<> wrote:
> On 10/07/2011 04:22 AM, Solar Designer wrote:
>> 2) An arbitrary file overwrite flaw was found in radvd's
>> set_interface_var() function, where it did not check the interface name
>> (generated by the unprivileged user) and blindly overwrites a filename
>> with a decimal value by the root process.  If a local attacker could
>> create symlinks pointing to arbitrary files on the system, they could
>> overwrite the target file contents.  If only radvd is compromised (e.g.
>> no local access), the attacker may only overwrite files with specific
>> names only (PROC_SYS_IP6_* from radvd's pathnames.h). (CVE-2011-3602)
> I am looking at the patch for this particular issue and it seems wrong to
> me.
> Patch:
> Shouldnt this be:
>        /* No path traversal */
>        if (strstr(iface, "..") || strchr(iface, '/'))
>                return -1;

FWIW, this will reject too much;


Robert Święcki

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