[SECURITY] [DLA 288-2] openssh regression update

2015-09-30T03:38:12
ID DEBIAN:DLA-288-2:68C70
Type debian
Reporter Debian
Modified 2015-09-30T03:38:12

Description

Package : openssh Version : 1:5.5p1-6+squeeze7 CVE ID : CVE-2015-5600

In Debian LTS (squeeze), the fix for CVE-2015-5600[1] in openssh 1:5.5p1-6+squeeze7 breaks authentication mechanisms that rely on the keyboard-interactive method. Thanks to Colin Watson for making aware of that.

The patch fixing CVE-2015-5600 introduces the field 'devices_done' to the KbdintAuthctxt struct, but does not initialize the field in the kbdint_alloc() function. On Linux, this ends up filling that field with junk data. The result of this are random login failures when keyboard-interactive authentication is used.

This upload of openssh 1:5.5p1-6+squeeze7 to Debian LTS (squeeze) adds that initialization of the devices_done field alongside the existing initialization code.

People relying on keyboard-interactive based authentication mechanisms with OpenSSH on Debian squeeze(-lts) systems are recommended to upgrade OpenSSH to 1:5.5p1-6+squeeze7.

[1] https://lists.debian.org/debian-lts-announce/2015/08/msg00001.html

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mike gabriel aka sunweaver (Debian Developer) fon: +49 (1520) 1976 148

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