Bug 2251118 (CVE-2023-48706)

Summary:	CVE-2023-48706 vim: use-after-free in ex_substitute in Vim
Product:	[Other] Security Response	Reporter:	Patrick Del Bello <pdelbell>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	vim 9.0.2121	Doc Type:	---
Doc Text:	A heap use-after-free flaw was found in the vim package. When executing a `:s` command for the first time and using a sub-replace-special atom inside the substitution part, it is possible that the recursive `:s` call causes memory to be freed, which may later then be accessed by the initial `:s` command. This issue may result in Vim crashing.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2251119
Bug Blocks:	2251117

Description Patrick Del Bello 2023-11-23 01:13:29 UTC

Vim is a UNIX editor that, prior to version 9.0.2121, has a heap-use-after-free vulnerability. When executing a `:s` command for the very first time and using a sub-replace-special atom inside the substitution part, it is possible that the recursive `:s` call causes free-ing of memory which may later then be accessed by the initial `:s` command. The user must intentionally execute the payload and the whole process is a bit tricky to do since it seems to work only reliably for the very first :s command. It may also cause a crash of Vim. Version 9.0.2121 contains a fix for this issue.

http://www.openwall.com/lists/oss-security/2023/11/22/3
https://github.com/gandalf4a/crash_report/blob/main/vim/vim_huaf
https://github.com/vim/vim/commit/26c11c56888d01e298cd8044caf860f3c26f57bb
https://github.com/vim/vim/pull/13552
https://github.com/vim/vim/security/advisories/GHSA-c8qm-x72m-q53q

Comment 1 Patrick Del Bello 2023-11-23 01:14:21 UTC

Created vim tracking bugs for this issue:

Affects: fedora-all [bug 2251119]