OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1036487 |
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SecurityTracker URL: http://securitytracker.com/id/1036487
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CVE Reference:
CVE-2015-8325, CVE-2016-6515
(Links to External Site)
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Updated: Aug 11 2016
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Original Entry Date: Aug 1 2016
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Impact:
Denial of service via network, Disclosure of system information, Disclosure of user information, User access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 7.3
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Description:
Several vulnerabilities were reported in OpenSSH. A remote user can consume excessive CPU resources on the target system. A local user can obtain elevated privileges on the target system. A remote or local user can obtain potentially sensitive information on the target system.
A remote user can submit specially crafted (long) passwords to the target server to cause the crypt(3) function to consume excessive CPU resources on the target system [CVE-2016-6515]. Tomas Kuthan (Oracle), Andres Rojas, and Javier Nieto separately reported this vulnerability.
A local user can set specially crafted environment variables to conduct attacks against the 'bin/login' process on systems where PAM is configured to read user-specified environment variables and 'sshd_config' is set with'UseLogin=yes' [CVE-2015-8325]. The sshd(8) portable version is affected. Shayan Sadigh reported this vulnerability.
A remote or local user may be able to observe timing differences in the ssh(1) and sshd(8) CBC padding oracle countermeasures. Jean Paul Degabriele, Kenny Paterson, Torben Hansen, and Martin Albrecht reported this vulnerability.
A remote or local user may be able to detect timing differences in the ssh(1) and sshd(8) MAC verification for Encrypt-then-MAC (EtM) mode transport MAC algorithms. No leakage has been observed. Jean Paul Degabriele, Kenny Paterson, Torben Hansen, and Martin Albrecht reported this vulnerability.
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Impact:
A remote user can consume excessive CPU resources on the target system.
A local user can obtain elevated privileges on the target system.
A remote or local user can obtain potentially sensitive timing information.
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Solution:
The vendor has issued a fix (7.3).
The vendor advisory is available at:
http://www.openssh.com/txt/release-7.3
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Vendor URL: www.openssh.com/txt/release-7.3 (Links to External Site)
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Cause:
Access control error, Input validation error, State error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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[Original Message Not Available for Viewing]
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