Bug 2039846 (CVE-2022-0158)

Summary:	CVE-2022-0158 vim: heap-based read buffer overflow in compile_get_env()
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bdettelb, caswilli, dhalasz, fjansen, gchamoul, jburrell, jwong, karsten, kaycoth, micjohns, sthirugn, vkrizan, vkumar, vmugicag, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	vim 8.2.4049	Doc Type:	If docs needed, set a value
Doc Text:	It was found that vim was vulnerable to a 1 byte heap based out of bounds read flaw in the `compile_get_env()` function. A file could use that flaw to disclose 1 byte of vim's internal memory.	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:	2039848, 2040325, 2043462
Bug Blocks:	2039688

Description Marian Rehak 2022-01-12 14:32:56 UTC

Possible Heap-based Buffer Overflow.

Reference:

https://huntr.dev/bounties/ac5d7005-07c6-4a0a-b251-ba9cdbf6738b
https://github.com/vim/vim/commit/5f25c3855071bd7e26255c68bf458b1b5cf92f39

Comment 1 Marian Rehak 2022-01-12 14:33:14 UTC

Created vim tracking bugs for this issue:

Affects: fedora-all [bug 2039848]

Comment 5 Cedric Buissart 2022-01-13 13:46:06 UTC

This flaw does not affect vim versions prior to 8.2. 
Since it is a 1 byte out of bound read, it would not be sufficient to crash vim (except if recompiled with an address sanitizer)