sudo: CVE-2013-1775 authentication bypass when clock is reset

Debian Bug report logs - #701838
sudo: CVE-2013-1775 authentication bypass when clock is reset

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Nico Golde <nion@debian.org>

To: submit@bugs.debian.org

Subject: sudo: CVE-2013-1775 authentication bypass when clock is reset

Date: Wed, 27 Feb 2013 21:10:03 +0100

[Message part 1 (text/plain, inline)]

Package: sudo
Severity: grave
Tags: security

Hi,
the following vulnerability was published for sudo.

CVE-2013-1775[0]:
(from the upstream report)

Sudo 1.8.6p7 and 1.7.10p7 are now available which include a fix
for the following bug:

Sudo authentication bypass when clock is reset

Summary:
    When a user successfully authenticates with sudo, a time stamp
    file is updated to allow that user to continue running sudo
    without requiring a password for a preset time period (five
    minutes by default).  The user's time stamp file can be reset
    using "sudo -k" or removed altogether via "sudo -K".

    A user who has sudo access and is able to control the local
    clock (common in desktop environments) can run a command via
    sudo without authenticating as long as they have previously
    authenticated themselves at least once by running "sudo -k" and
    then setting the clock to the epoch (1970-01-01 01:00:00).

    The vulnerability does not permit a user to run commands other
    than those allowed by the sudoers policy.

Sudo versions affected:
    Sudo 1.6.0 through 1.7.10p7 and sudo 1.8.0 through 1.8.6p7.

Details:
    By default, sudo displays a lecture when the user's time stamp
    file is not present.  In sudo 1.6, the -k option was changed
    to reset the time stamp file to the epoch rather than remove
    it to prevent the lecture from being displayed the next time
    sudo was run.  No special case was added for handling a time
    stamp file set to the epoch since the clock should never
    legitimately be set to that value.

    However, there are two common ways for the clock to be reset
    to the epoch.  The first way is when the clock is reset due to
    a fully drained battery on some systems.  The other way is by
    a user logged in to a desktop environment that allows changes
    to the date and time.

    As long as the user has successfully run sudo before, they are
    able to run "sudo -k" to reset the time stamp file.  This action
    does not require a password and is not logged.  If the user is
    also able to reset the date and time to the epoch (1970-01-01
    01:00:00), they will be able to run sudo without having to
    authenticate.

Impact:
    The flaw may allow someone with physical access to a machine
    that is not password-protected to run sudo commands without
    knowing the logged in user's password.  On systems where sudo
    is the principal way of running commands as root, such as on
    Ubuntu and Mac OS X, there is a greater chance that the logged
    in user has run sudo before and thus that an attack would
    succeed.

Fix:
    The bug is fixed in sudo 1.8.6p7 and 1.7.10p7.  These versions
    will ignore a time stamp file that is set to the epoch.

Workaround:
    Using "sudo -K" instead of "sudo -k" will completely remove the
    time stamp file instead of just resetting it.

Credit:
    I'd like to thank Marco Schoepl for finding and reporting this
    long-standing bug.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1775
    http://security-tracker.debian.org/tracker/CVE-2013-1775
Please adjust the affected versions in the BTS as needed.

Cheers
Nico

-- 
Nico Golde - http://www.ngolde.de - nion@jabber.ccc.de - GPG: 0xA0A0AAAA

[Message part 2 (application/pgp-signature, inline)]

Message #10 received at 701838-close@bugs.debian.org (full text, mbox, reply):

From: Michael Gilbert <mgilbert@debian.org>

To: 701838-close@bugs.debian.org

Subject: Bug#701838: fixed in sudo 1.8.5p2-1+nmu1

Date: Fri, 01 Mar 2013 05:32:53 +0000

Source: sudo
Source-Version: 1.8.5p2-1+nmu1

We believe that the bug you reported is fixed in the latest version of
sudo, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 701838@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Gilbert <mgilbert@debian.org> (supplier of updated sudo package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Fri, 01 Mar 2013 03:26:37 +0000
Source: sudo
Binary: sudo sudo-ldap
Architecture: source amd64
Version: 1.8.5p2-1+nmu1
Distribution: unstable
Urgency: high
Maintainer: Bdale Garbee <bdale@gag.com>
Changed-By: Michael Gilbert <mgilbert@debian.org>
Description: 
 sudo       - Provide limited super user privileges to specific users
 sudo-ldap  - Provide limited super user privileges to specific users
Closes: 701838 701839
Changes: 
 sudo (1.8.5p2-1+nmu1) unstable; urgency=high
 .
   * Non-maintainer upload by the Security Team.
   * Fix cve-2013-1775: authentication bypass when the clock is set to the UNIX
     epoch [00:00:00 UTC on 1 January 1970] (closes: #701838).
   * Fix cve-2013-1776: session id hijacking from another authorized tty
     (closes: #701839).
Checksums-Sha1: 
 05a116304df73e20148759ebfecee6f9dfe96725 2589 sudo_1.8.5p2-1+nmu1.dsc
 2052bd6151dc62d71715762e6a192df404a9235f 26822 sudo_1.8.5p2-1+nmu1.debian.tar.gz
 b47bb046d0fa4ce2c1743c1e45e9d42a6c5251c4 842220 sudo_1.8.5p2-1+nmu1_amd64.deb
 cd0baf39ba2dc417d3dd4bc97e95e4732d176607 863082 sudo-ldap_1.8.5p2-1+nmu1_amd64.deb
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Files: 
 0d259053017092470a1d804503ee3a42 2589 admin optional sudo_1.8.5p2-1+nmu1.dsc
 149d2138846fc7121cfcd3ff4df7fea9 26822 admin optional sudo_1.8.5p2-1+nmu1.debian.tar.gz
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Message #15 received at 701838@bugs.debian.org (full text, mbox, reply):

From: Michael Gilbert <mgilbert@debian.org>

To: 701838@bugs.debian.org, 701839@bugs.debian.org

Subject: nmu for security issues

Date: Fri, 1 Mar 2013 01:04:11 -0500

[Message part 1 (text/plain, inline)]

Hi,

I uploaded an nmu fixing the recent security issues.  Please see attached patch.

Best wishes,
Mike

[sudo.patch (application/octet-stream, attachment)]

Message #20 received at 701838@bugs.debian.org (full text, mbox, reply):

From: Bdale Garbee <bdale@gag.com>

To: Michael Gilbert <mgilbert@debian.org>, 701838@bugs.debian.org, 701838@bugs.debian.org, 701839@bugs.debian.org

Subject: Re: Bug#701838: nmu for security issues

Date: Fri, 01 Mar 2013 07:22:27 -0700

[Message part 1 (text/plain, inline)]

Michael Gilbert <mgilbert@debian.org> writes:

> I uploaded an nmu fixing the recent security issues.  Please see
> attached patch. 

Thanks.

Bdale

[Message part 2 (application/pgp-signature, inline)]

Message #25 received at 701838-close@bugs.debian.org (full text, mbox, reply):

From: Michael Gilbert <mgilbert@debian.org>

To: 701838-close@bugs.debian.org

Subject: Bug#701838: fixed in sudo 1.7.4p4-2.squeeze.4

Date: Sun, 10 Mar 2013 17:02:21 +0000

Source: sudo
Source-Version: 1.7.4p4-2.squeeze.4

We believe that the bug you reported is fixed in the latest version of
sudo, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 701838@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Gilbert <mgilbert@debian.org> (supplier of updated sudo package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.8
Date: Wed, 06 Mar 2013 18:41:15 +0000
Source: sudo
Binary: sudo sudo-ldap
Architecture: source amd64
Version: 1.7.4p4-2.squeeze.4
Distribution: stable-security
Urgency: high
Maintainer: Bdale Garbee <bdale@gag.com>
Changed-By: Michael Gilbert <mgilbert@debian.org>
Description: 
 sudo       - Provide limited super user privileges to specific users
 sudo-ldap  - Provide limited super user privileges to specific users
Closes: 701838 701839
Changes: 
 sudo (1.7.4p4-2.squeeze.4) stable-security; urgency=high
 .
   * Fix cve-2013-1775: authentication bypass when the clock is set to the UNIX
     epoch [00:00:00 UTC on 1 January 1970] (closes: #701838).
   * Fix cve-2013-1776: session id hijacking from another authorized tty
     (closes: #701839).
Checksums-Sha1: 
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