[SECURITY-L] Fwd: [USN-2912-1] libssh vulnerabilities
CSIRT Unicamp
security em unicamp.br
Qua Fev 24 08:47:42 -03 2016
-------- Mensagem encaminhada --------
Assunto: [USN-2912-1] libssh vulnerabilities
Data: Tue, 23 Feb 2016 10:03:56 -0500
De: Marc Deslauriers <marc.deslauriers em canonical.com>
Responder a: ubuntu-users em lists.ubuntu.com, Ubuntu Security
<security em ubuntu.com>
Para: ubuntu-security-announce em lists.ubuntu.com
==========================================================================
Ubuntu Security Notice USN-2912-1
February 23, 2016
libssh vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary:
Several security issues were fixed in libssh.
Software Description:
- libssh: A tiny C SSH library
Details:
Mariusz Ziulek discovered that libssh incorrectly handled certain packets.
A remote attacker could possibly use this issue to cause libssh to crash,
resulting in a denial of service.
(CVE-2015-3146)
Aris Adamantiadis discovered that libssh incorrectly generated ephemeral
secret keys of 128 bits instead of the recommended 1024 or 2048 bits when
using the diffie-hellman-group1 and diffie-hellman-group14 methods. If a
remote attacker were able to perform a man-in-the-middle attack, this flaw
could be exploited to view sensitive information. (CVE-2016-0739)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 15.10:
libssh-4 0.6.3-3ubuntu3.2
Ubuntu 14.04 LTS:
libssh-4 0.6.1-0ubuntu3.3
Ubuntu 12.04 LTS:
libssh-4 0.5.2-1ubuntu0.12.04.6
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-2912-1
CVE-2015-3146, CVE-2016-0739
Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.6.3-3ubuntu3.2
https://launchpad.net/ubuntu/+source/libssh/0.6.1-0ubuntu3.3
https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.12.04.6
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