Bug 803358 (CVE-2012-1174)

Summary: CVE-2012-1174 systemd (systemd-logind): TOCTOU race condition by removing user session
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: mschmidt, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2021-10-19 21:52:01 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 804118    
Bug Blocks:    
Attachments:
Description Flags
Proposed patch from Michal Schmidt, original issue reporter none

Description Jan Lieskovsky 2012-03-14 14:27:45 UTC 
A TOCTOU race condition was found in the way the systemd-logind login manager of the systemd, a system and service manager for Linux, performed removal of particular records related with user session upon user logout. A local attacker could use this flaw to conduct symbolic link attacks, potentially leading to removal of arbitrary system file.
Comment 2 Jan Lieskovsky 2012-03-14 14:33:11 UTC 
Created attachment 570001 [details]
Proposed patch from Michal Schmidt, original issue reporter
Comment 3 Jan Lieskovsky 2012-03-14 14:33:54 UTC 
This issue affects the versions of the systemd package, as shipped with Fedora release of 15 and 16.
Comment 4 Jan Lieskovsky 2012-03-14 14:34:24 UTC 
The preliminary embargo date for this issue has been set up to this Friday, 2012-03-16.
Comment 5 Jan Lieskovsky 2012-03-14 14:37:52 UTC 
The CVE identifier of CVE-2012-1174 has been assigned to this issue.
Comment 7 Michal Schmidt 2012-03-14 15:08:46 UTC 
(In reply to comment #3)
> This issue affects the versions of the systemd package, as shipped with Fedora
> release of 15 and 16.

Just a note: The above sentence is correct, even though F15 does not contain the systemd-logind daemon. In F15 the vulnerable code is called from the PAM module instead. I haven't tried exploiting it on F15, but I see nothing that would make it impossible.
Comment 10 Jan Lieskovsky 2012-03-16 15:11:33 UTC 
Created systemd tracking bugs for this issue

Affects: fedora-all [bug 804118]
Comment 11 Jan Lieskovsky 2012-03-16 17:43:46 UTC 
Upstream patch:
[1] http://cgit.freedesktop.org/systemd/systemd/commit/?id=5ebff5337594d690b322078c512eb222d34aaa82
Comment 12 Fedora Update System 2012-03-26 03:54:45 UTC 
systemd-26-18.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 13 Fedora Update System 2012-03-26 03:58:25 UTC 
systemd-37-17.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 14 Fedora Update System 2012-03-26 17:55:09 UTC 
systemd-26-18.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 15 Fedora Update System 2012-03-26 18:00:15 UTC 
systemd-37-17.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 16 Fedora Update System 2012-04-25 05:02:58 UTC 
systemd-44-6.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.