Bug 2163499 (CVE-2023-0210)

Summary:	CVE-2023-0210 Kernel: Heap overflow in ksmbd_decode_ntlmssp_auth_blob cause remote DOS
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, bhu, chwhite, crwood, ddepaula, debarbos, dfreiber, dhoward, dvlasenk, ezulian, fhrbata, hkrzesin, jarod, jburrell, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rogbas, rvrbovsk, scweaver, tyberry, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 6.2 RC4	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-01-25 17:22:16 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:	2159928

Description Rohit Keshri 2023-01-23 17:36:53 UTC

A heap overflow bug in ksmbd_decode_ntlmssp_auth_blob in which nt_len can be less than CIFS_ENCPWD_SIZE. This results in a negative blen argument for ksmbd_auth_ntlmv2, where it calls memcpy using blen on memory allocated by kmalloc(blen + CIFS_CRYPTO_KEY_SIZE). Note that CIFS_ENCPWD_SIZE is 16 and CIFS_CRYPTO_KEY_SIZE is 8. We believe this bug can only result in a remote DOS and not privilege escalation nor RCE, as the heap overflow occurs when blen is in range (-8, -1].”

Reference:
https://securityonline.info/cve-2023-0210-flaw-in-linux-kernel-allows-unauthenticated-remote-dos-attacks/
https://www.spinics.net/lists/stable-commits/msg282893.html

Comment 2 Rohit Keshri 2023-01-23 17:49:45 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 2023-01-25 17:22:12 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-2023-0210