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

[news 28]

openSUSE Security Update: Security update for dropbear

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Announcement ID: openSUSE-SU-2016:1891-1

Rating: critical

References: #990363

Affected Products:

openSUSE Leap 42.1

openSUSE 13.2

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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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