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[security-announce] openSUSE-SU-2016:1891-1: critical: Security update for dropbear
openSUSE Security Update: Security update for dropbear
______________________________________________________________________________

Announcement ID: openSUSE-SU-2016:1891-1
Rating: critical
References: #990363
Affected Products:
openSUSE Leap 42.1
openSUSE 13.2
______________________________________________________________________________

An update that contains security fixes can now be installed.

Description:

This update for dropbear fixes four security issues (bnc#990363):

- A format string injection vulnerability allowed remotes attacker to run
arbitrary code as root if specific usernames including "%" symbols could
be created on the target system. If a dbclient user can control
usernames or host arguments, or untrusted input is processed,
potentially arbitrary code could have been executed as the dbclient user.
- When importing malicious OpenSSH key files via dropbearconvert,
arbitrary code could have been executed as the local dropbearconvert user
- If particular -m or -c arguments were provided, as used in scripts,
dbclient could have executed arbitrary code
- dbclient or dropbear server could have exposed process memory to the
running user if compiled with DEBUG_TRACE and running with -v

Dropbear was updated to the upstream 2016.74 release, including fixes for
the following upstream issues:

- Port forwarding failure when connecting to domains that have both IPv4
and IPv6 addresses
- 100% CPU use while waiting for rekey to complete
- Fix crash when fallback initshells() is used scp failing when the local
user doesn't exist

The following upstream improvements are included:

- Support syslog in dbclient, option -o usesyslog=yes
- Kill a proxycommand when dbclient exits
- Option to exit when a TCP forward fails
- Allow specifying commands eg "dropbearmulti dbclient ..." instead of
symlinks


Patch Instructions:

To install this openSUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product:

- openSUSE Leap 42.1:

zypper in -t patch openSUSE-2016-912=1

- openSUSE 13.2:

zypper in -t patch openSUSE-2016-912=1

To bring your system up-to-date, use "zypper patch".


Package List:

- openSUSE Leap 42.1 (i586 x86_64):

dropbear-2016.74-11.1
dropbear-debuginfo-2016.74-11.1
dropbear-debugsource-2016.74-11.1

- openSUSE 13.2 (i586 x86_64):

dropbear-2016.74-2.6.1
dropbear-debuginfo-2016.74-2.6.1
dropbear-debugsource-2016.74-2.6.1


References:

https://bugzilla.suse.com/990363

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