Mageia alert MGASA-2016-0280 (openssh)

From:
    	     
 
Mageia Updates <buildsystem-daemon@mageia.org> 
To:
    	     
 
updates-announce@ml.mageia.org 
Subject:
    	     
 
[updates-announce] MGASA-2016-0280: Updated openssh packages fix security vulnerability 
Date:
    	     
 
Wed, 31 Aug 2016 17:33:06 +0200
Message-ID:
    	     
 
<20160831153307.012C99F77B@duvel.mageia.org>
MGASA-2016-0280 - Updated openssh packages fix security vulnerability

Publication date: 31 Aug 2016
URL: http://advisories.mageia.org/MGASA-2016-0280.html
Type: security
Affected Mageia releases: 5
CVE: CVE-2015-8325,
     CVE-2016-6210,
     CVE-2016-6515

Description:
The do_setup_env function in session.c in sshd in OpenSSH through 7.2p2,
when the UseLogin feature is enabled and PAM is configured to read
.pam_environment files in user home directories, allows local users to
gain privileges by triggering a crafted environment for the /bin/login
program, as demonstrated by an LD_PRELOAD environment variable
(CVE-2015-8325).

When SSHD tries to authenticate a non-existing user, it will pick up a
fake password structure hard-coded in the SSHD source code. An attacker
can measure timing information to determine if a user exists when
verifying a password (CVE-2016-6210).

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3
does not limit password lengths for password authentication, which allows
remote attackers to cause a denial of service (crypt CPU consumption) via
a long string (CVE-2016-6515).

Note that CVE-2015-8325 and CVE-2016-6210 wouldn't affect most Mageia
systems, as UseLogin is not enabled by default and Mageia uses Blowfish
password hashes by default.

References:
- https://bugs.mageia.org/show_bug.cgi?id=18222
- https://www.debian.org/security/2016/dsa-3550
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-6210
-
https://lists.fedoraproject.org/archives/list/package-ann...
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8325
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6210
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6515

SRPMS:
- 5/core/openssh-6.6p1-5.9.mga5