openSUSE-SU-2016:1891-1

Описание

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