[arch-security] [ASA-201603-19] dropbear: command injection
anthraxx at archlinux.org
Mon Mar 14 20:11:08 UTC 2016
Arch Linux Security Advisory ASA-201603-19
Date : 2016-03-14
CVE-ID : CVE-2016-3116
Package : dropbear
Type : command injection
Remote : Yes
Link : https://wiki.archlinux.org/index.php/CVE
The package dropbear before version 2016.72-1 is vulnerable to command
injection leading to information disclosure, directory traversal and
possibly other impact.
Upgrade to 2016.72-1.
# pacman -Syu "dropbear>=2016.72-1"
The problem has been fixed upstream in version 2016.72.
Set X11Forwarding=no in sshd_config. This is the default.
For authorized_keys that specify a "command" restriction, also set the
"restrict" or "no-x11-forwarding" restrictions.
A vulnerability was found in a way dropbear processed X11 forwarding
input. By using a specially crafted request, an attacker could bypass
the authorized_keys command restrictions.
xauth is run under the user's privilege, so this vulnerability offers no
additional access to unrestricted accounts, but could circumvent key or
account restrictions such as sshd_config ForceCommand, authorized_keys
command="..." or restricted shells.
A remote authenticated user who is able to request X11 forwarding can
inject commands leading to information disclosure, directory traversal
and possibly other impact.
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