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Debian Security Advisory DSA-3626-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
July 24, 2016                         https://www.debian.org/security/faq
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Package        : openssh
CVE ID         : CVE-2016-6210
Debian Bug     : 831902

Eddie Harari reported that the OpenSSH SSH daemon allows user
enumeration through timing differences when trying to authenticate
users. When sshd tries to authenticate a non-existing user, it will pick
up a fixed fake password structure with a hash based on the Blowfish
algorithm. If real users passwords are hashed using SHA256/SHA512, then
a remote attacker can take advantage of this flaw by sending large
passwords, receiving shorter response times from the server for
non-existing users.

For the stable distribution (jessie), this problem has been fixed in
version 1:6.7p1-5+deb8u3.

For the unstable distribution (sid), this problem has been fixed in
version 1:7.2p2-6.

We recommend that you upgrade your openssh packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

Debian: DSA-3626-1: openssh security update

July 24, 2016
Eddie Harari reported that the OpenSSH SSH daemon allows user enumeration through timing differences when trying to authenticate users

Summary

For the stable distribution (jessie), this problem has been fixed in
version 1:6.7p1-5+deb8u3.

For the unstable distribution (sid), this problem has been fixed in
version 1:7.2p2-6.

We recommend that you upgrade your openssh packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

Severity
Eddie Harari reported that the OpenSSH SSH daemon allows user
enumeration through timing differences when trying to authenticate
users. When sshd tries to authenticate a non-existing user, it will pick
up a fixed fake password structure with a hash based on the Blowfish
algorithm. If real users passwords are hashed using SHA256/SHA512, then
a remote attacker can take advantage of this flaw by sending large
passwords, receiving shorter response times from the server for
non-existing users.

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