Bug 2208849 (CVE-2023-32250, ZDI-23-698, ZDI-CAN-20481)

Summary:	CVE-2023-32250 kernel: ksmbd: session race condition remote code execution vulnerability
Product:	[Other] Security Response	Reporter:	Rohit Keshri <rkeshri>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dvlasenk, ezulian, hkrzesin, jarod, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rrobaina, rvrbovsk, rysulliv, scweaver, tyberry, walters, wcosta, williams, wmealing, ycote
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 6.4-rc1	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-21 19:41:26 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:
Bug Blocks:	2190273

Description Rohit Keshri 2023-05-21 14:46:04 UTC

A vulnerability was found in fs/ksmbd/connection.c in ksmbd in the Linux Kernel. This flaw allows remote attackers to execute arbitrary code 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 processing of SMB2_SESSION_SETUP commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Reference:
https://github.com/torvalds/linux/commit/f5c779b7ddbda30866cf2a27c63e34158f858c73
https://www.zerodayinitiative.com/advisories/ZDI-23-698/

Comment 1 Rohit Keshri 2023-05-21 14:58:27 UTC

There was no shipped kernel version were seen affected with this problem. These files are not built in our source code.

Comment 4 Product Security DevOps Team 2023-05-21 19:41:23 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2023-32250