2029513 – (CVE-2021-4069) CVE-2021-4069 vim: use-after-free in ex_open() in src/ex_docmd.c

Bug 2029513 (CVE-2021-4069) - CVE-2021-4069 vim: use-after-free in ex_open() in src/ex_docmd.c

Summary: CVE-2021-4069 vim: use-after-free in ex_open() in src/ex_docmd.c

Keywords:
Status:	NEW
Alias:	CVE-2021-4069
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	low
Severity:	low
Target Milestone:	---
Assignee:	Nobody
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	2029514 2029776 2029783
Blocks:	2029515
TreeView+	depends on / blocked

Reported:	2021-12-06 16:51 UTC by Guilherme de Almeida Suckevicz
Modified:	2023-10-25 17:21 UTC (History)
CC List:	15 users (show)
Fixed In Version:	vim 8.2.3741
Doc Type:	If docs needed, set a value
Doc Text:	A heap use-after-free flaw was found in Vim's ex_open() function in src/ex_docmd.c file. This flaw allows an attacker to trick the victim into opening a specially crafted file that triggers a use-after-free error, allowing the attacker to compromise the system and execute arbitrary code.
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Description Guilherme de Almeida Suckevicz 2021-12-06 16:51:02 UTC

Vim is vulnerable to use-after-free.

Reference:
https://huntr.dev/bounties/0efd6d23-2259-4081-9ff1-3ade26907d74

Upstream patch:
https://github.com/vim/vim/commit/e031fe90cf2e375ce861ff5e5e281e4ad229ebb9

Comment 1 Guilherme de Almeida Suckevicz 2021-12-06 16:51:17 UTC

Created vim tracking bugs for this issue:

Affects: fedora-all [bug 2029514]

Comment 2 lnacshon 2021-12-07 09:54:58 UTC

published PCO

Create a file with content 
)/\v/
o/\%')

execute vim -u NONE -X -Z -e -s -S file -c :qa!

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