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Date: Wed, 29 Jun 2011 14:00:08 +0800
From: Eugene Teo <>
CC: Josh Bressers <>
Subject: Re: CVE request: kernel: taskstats/procfs io infoleak
 (was: taskstats authorized_keys presence infoleak PoC)

On 06/29/2011 04:22 AM, Josh Bressers wrote:
> ----- Original Message -----
>> It can be used to learn ssh and ftp password length. If privsep is
>> enabled in openssh and vsftpd, the unprivileged process' activity very
>> precisely shows password information.
>> For vsftpd read characters count is strlen("USER username\r\n") +
>> strlen("PASSWD pass\r\n") + 1, where 1 is one byte read from a pipe
>> related to a privileged parent. If measure statistics between user and
>> passwords commands, actual password length and username length can be
>> gathered.
>> For ssh, vice versa, networking activity is constant in packets length,
>> but interprocess communications, specifically passwords, depend on user
>> input.
>> For ssh pass_len = wchars - CONST, for vsftpd pass_len = rchars -
>> Another daemons with more or less constant io activity might be
>> vulnerable too. PAM greatly complicates precise measurements.
>> I think it needs 2 CVE, one for /proc/PID/io and another for
>> taskstats.
> I can't find a nice description of both issues. Can you give me one or two
> sentence explanations with a few references for the CVE database?
> Once I have those I'll give it two IDs.

I have assigned the CVE names for these two issues.

Thanks, Eugene

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