Bug 1898127 (CVE-2020-27746)

Summary: CVE-2020-27746: slurm: potential leak of the magic cookie when sent as an argument to the xauth command
Product: [Other] Security Response Reporter: Michael Kaplan <mkaplan>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: pkfed
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: slurm 20.11.0rc2, slurm 20.02.6, slurm 19.05.8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-11-16 17:28:35 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:
Bug Depends On: 1898128    
Bug Blocks:    

Description Michael Kaplan 2020-11-16 13:14:19 UTC 
Slurm's use of the 'xauth' command to manage X11 magic cookies can lead to an inadvertent disclosure of a user's cookie when setting up X11 forwarding on a node. An attacker monitoring /proc on the node could race the setup and steal the magic cookie, which may let them connect to that user's X11 session. A job would only be impacted if --x11 was requested at submission time.
Comment 1 Michael Kaplan 2020-11-16 13:14:22 UTC 
External References:

https://github.com/SchedMD/slurm/commit/07309deb45c33e735e191faf9dd31cca1054a15c
https://lists.schedmd.com/pipermail/slurm-announce/2020/000045.html
https://www.schedmd.com/news.php?id=240
Comment 2 Michael Kaplan 2020-11-16 13:14:37 UTC 
Created slurm tracking bugs for this issue:

Affects: fedora-all [bug 1898128]
Comment 3 Product Security DevOps Team 2020-11-16 17:28:35 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.