Gambas Directory hijack vulnerability The gambas software package creates a directory in tmp to work from without verifying another user hasn't already created it. This allows a local user to hijack ownership. Describe the problem. Gambas creates a directory in /tmp called gambas.UID where UID is the user id of the person running the software. Gambas doesn't check to see if a malicious user has already created that directory. A malicious user can then manipulate (mv or remove) that directory once gambas has created files under it. larry@aliquot:/tmp$ mkdir gambas.0 larry@aliquot:/tmp$ ls -ld gambas.0 drwxr-xr-x 2 larry staff 4096 2012-12-13 16:37 gambas.0 larry@aliquot:/tmp$ cd gambas.0 larry@aliquot:/tmp/gambas.0$ ls larry@aliquot:/tmp/gambas.0$ ls -l total 4 drwx------ 2 root root 4096 2012-12-13 16:37 25257 larry@aliquot:/tmp/gambas.0$ rm -rf 25257 larry@aliquot:/tmp/gambas.0$ User larry was able to remove the directory gambas created as root. 2) GIVE THE FOLLOWING INFORMATIONS (if they are appropriate): Version: gambas3-runtime-3.3.4~lucid2 Revision: Operating system: Linux Distribution: Ubunt Architecture: x86_64 GUI component: QT3 / QT4 / GTK+ Desktop used: Gnome 3) Provide a little project that reproduces the bug or the crash. ubuntu-builder runs as root 4) If your project needs a database, try to provide it, or part of it. 5) Explain clearly how to reproduce the bug or the crash. 6) By doing that carefully, you have done 50% of the bug fix job! IMPORTANT NOTE: if you encounter several different problems or bugs, (for example, a bug in your project, and an interpreter crash while debugging it), please create distinct issues! See bug posted here for details and fix from vendor: http://code.google.com/p/gambas/issues/detail?id=365 @_larry0 Larry W. Cashdollar http://otiose.dhs.org?