Bug 71468
| Summary: | Bad permissions in /dev after ctrl-alt-backspace in X. | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Need Real Name <qjm3> |
| Component: | pam | Assignee: | Nalin Dahyabhai <nalin> |
| Status: | CLOSED DUPLICATE | QA Contact: | Jay Turner <jturner> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.3 | CC: | srevivo |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2002-08-13 23:00:01 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
From Bugzilla Helper: User-Agent: Mozilla/5.0 Galeon/1.2.0 (X11; Linux i686; U;) Gecko/20020408 Description of problem: A ctrl-alt-backspace on an xserver fails to reset the permissions from /etc/security/console.perms so the original user owns the floppy, cdrom, sound etc. pam_console_apply -r does not reset /dev/console either. Version-Release number of selected component (if applicable): 0.75-32 How reproducible: Always Steps to Reproduce: 1. ctrl-alt-backspace in kde [served from kdm] 2. login as different user 3. Cannot access /dev/{fd0,dsp} etc Actual Results: Original user is listed in /var/run/console/$USER and in /var/run/console.lock, and owns all the files in /dev as according to /etc/security/console.perms, when they are not actually logged in. Subsequent logins with correct logouts by original user do not alter the permissions. The original user retains all /dev permissions until reboot. Expected Results: Ownership of /dev/{fd0,dsp} etc should have reverted to root. Subsequently running pam_console_apply -r to reset the perms fails to reset the /dev/console ownership. The original user logging in + out correctly could fix the problem? Additional info: Security Risk: In principal a rogue user can use this to get remote access to the microphone, speaker, etc by using ctrl-alt-backspace to logout and then subsequently logging in remotely. Denial of floppy + sound to other users. Redhat 7.3 using kerberos5 + NIS, default pam, using kde + kdm An additional last-minute earch came up with Bug #59936