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Date: Thu, 18 Aug 2016 17:13:12 -0400 (EDT)
From: cve-assign@...re.org
To: eric.pruitt@...il.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request - slock, all versions NULL pointer dereference

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> The screen locking application slock (http://tools.suckless.org/slock/)
> calls crypt(3) and uses the return value for strcmp(3) without checking
> to see if the return value of crypt(3) was a NULL pointer. If the hash
> returned by (getspnam()->sp_pwdp) is invalid, crypt(3) will return NULL
> and set errno to EINVAL. This will cause slock to segfault which then
> leaves the machine unprotected. A couple of common scenarios where this
> might happen are:
> 
> - a machine using NSS for authentication; on the machine I discovered
>   this bug, (getspnam()->sp_pwdp) returns "*".
> - the user's account has been disabled for one reason or another; maybe
>   account expiry or password expiry.

Use CVE-2016-6866.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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