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AUSCERT External Security Bulletin Redistribution
ESB-2018.0230
OpenSSH vulnerabilities
23 January 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: openssh-server
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Existing Account
Create Arbitrary Files -- Remote/Unauthenticated
Modify Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-15906 CVE-2016-10012 CVE-2016-10011
CVE-2016-10010 CVE-2016-10009
Reference: ESB-2018.1889
ESB-2017.0784
ESB-2017.0572
Original Bulletin:
http://www.ubuntu.com/usn/usn-3538-1
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Ubuntu Security Notice USN-3538-1
January 22, 2018
openssh vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in OpenSSH.
Software Description:
- - openssh: secure shell (SSH) for secure access to remote machines
Details:
Jann Horn discovered that OpenSSH incorrectly loaded PKCS#11 modules from
untrusted directories. A remote attacker could possibly use this issue to
execute arbitrary PKCS#11 modules. This issue only affected Ubuntu 14.04
LTS and Ubuntu 16.04 LTS. (CVE-2016-10009)
Jann Horn discovered that OpenSSH incorrectly handled permissions on
Unix-domain sockets when privilege separation is disabled. A local attacker
could possibly use this issue to gain privileges. This issue only affected
Ubuntu 16.04 LTS. (CVE-2016-10010)
Jann Horn discovered that OpenSSH incorrectly handled certain buffer memory
operations. A local attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 14.04 LTS and Ubuntu
16.04 LTS. (CVE-2016-10011)
Guido Vranken discovered that OpenSSH incorrectly handled certain shared
memory manager operations. A local attacker could possibly use issue to
gain privileges. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04
LTS. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-10012)
Michal Zalewski discovered that OpenSSH incorrectly prevented write
operations in readonly mode. A remote attacker could possibly use this
issue to create zero-length files, leading to a denial of service.
(CVE-2017-15906)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.10:
openssh-server 1:7.5p1-10ubuntu0.1
Ubuntu 16.04 LTS:
openssh-server 1:7.2p2-4ubuntu2.4
Ubuntu 14.04 LTS:
openssh-server 1:6.6p1-2ubuntu2.10
In general, a standard system update will make all the necessary changes.
References:
https://www.ubuntu.com/usn/usn-3538-1
CVE-2016-10009, CVE-2016-10010, CVE-2016-10011, CVE-2016-10012,
CVE-2017-15906
Package Information:
https://launchpad.net/ubuntu/+source/openssh/1:7.5p1-10ubuntu0.1
https://launchpad.net/ubuntu/+source/openssh/1:7.2p2-4ubuntu2.4
https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.10
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===========================================================================
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