Bug 1842658 (CVE-2019-20807)

Summary: CVE-2019-20807 vim: users can execute arbitrary OS commands via scripting interfaces in the rvim restricted mode
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gchamoul, huzaifas, karsten, zdohnal
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: vim 8.1.088, vim 8.2.0884 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in vim in the restricted mode, where all commands that make use of external shells are disabled. However, it was found that users could still execute some arbitrary OS commands in the restricted mode. This flaw was fixed by filtering the functions that can call OS commands. Interfaces such as Python, Ruby, and Lua, are also disabled, as they can be used to execute shell commands. Perl uses the Safe module.
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-11-04 02:25:41 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1842752, 1842754, 1842755    
Bug Blocks: 1842659    

Description Guilherme de Almeida Suckevicz 2020-06-01 19:21:31 UTC
In Vim before 8.1.0881, users can circumvent the rvim restricted mode and execute arbitrary OS commands via scripting interfaces (e.g., Python, Ruby, or Lua).

Reference and upstream commit:

Comment 1 Huzaifa S. Sidhpurwala 2020-06-02 03:44:49 UTC
Created vim tracking bugs for this issue:

Affects: fedora-all [bug 1842752]

Comment 4 Huzaifa S. Sidhpurwala 2020-06-02 03:53:05 UTC

Upstream suggests that users may still find loopholes to execute a shell commands, it has only been made difficult. So administrators should not assume that vim restricted mode will completely disable execution of OS commands.

Comment 8 errata-xmlrpc 2020-11-04 01:07:56 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4453 https://access.redhat.com/errata/RHSA-2020:4453

Comment 9 Product Security DevOps Team 2020-11-04 02:25:41 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):