Bug 1211531 (CVE-2023-32249)

Summary: VUL-0: CVE-2023-32249: kernel: Linux Kernel ksmbd Multichannel Improper Authentication Session Hijack Vulnerability
Product: [openSUSE] openSUSE Tumbleweed Reporter: Stoyan Manolov <stoyan.manolov>
Component: KernelAssignee: Security Team bot <security-team>
Status: RESOLVED UPSTREAM QA Contact: E-mail List <qa-bugs>
Severity: Normal    
Priority: P3 - Medium CC: ddiss, meissner, mkoutny, security-team
Version: Current   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/366973/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Stoyan Manolov 2023-05-19 07:33:59 UTC 
CVE-2023-32249

This vulnerability allows remote attackers to hijack a session on affected
installations of Linux Kernel. Authentication is not required to exploit this
vulnerability, but only systems with ksmbd enabled are vulnerable.

The specific flaw exists within the handling of Session ID within Multichannel.
The issue results from the lack of proper isolation when performing lookup on a
session. An attacker can leverage this vulnerability to hijack arbitrary live
session on the system.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-32249
https://www.zerodayinitiative.com/advisories/ZDI-23-697/
Comment 2 Michal Koutný 2023-05-22 16:29:54 UTC 
https://github.com/torvalds/linux/commit/3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2

Possibly needed in the `stable` branch before v6.4 is out.