Bug 1935055 (CVE-2021-28041) - CVE-2021-28041 openssh: double-free memory corruption may lead to arbitrary code execution
Summary: CVE-2021-28041 openssh: double-free memory corruption may lead to arbitrary c...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-28041
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1935057 1936971
Blocks: 1935059
TreeView+ depends on / blocked
 
Reported: 2021-03-04 10:25 UTC by Marian Rehak
Modified: 2022-04-17 21:11 UTC (History)
11 users (show)

Fixed In Version: openssh 8.5
Doc Type: If docs needed, set a value
Doc Text:
A double-free memory corruption flaw was found in OpenSSH 8.2, more specifically in ssh-agent application. This flaw allows an attacker with access to the agent socket to forward an agent either to an account shared with a malicious user or to a host with an attacker holding root access. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-03-08 19:01:49 UTC
Embargoed:

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Description Marian Rehak 2021-03-04 10:25:53 UTC 
A double-free memory corruption, introduced in OpenSSH 8.2, that could be reached by an attacker with access to the agent socket. Exploitable by a user forwarding an agent either to an account shared with a malicious user or to a host with an attacker holding root access.

Reference:

https://www.openssh.com/txt/release-8.5
Comment 1 Marian Rehak 2021-03-04 10:27:08 UTC 
Created openssh tracking bugs for this issue:

Affects: fedora-all [bug 1935057]
Comment 9 Marco Benatto 2021-03-09 17:49:31 UTC 
External References:

https://www.openssh.com/txt/release-8.5
Comment 10 RaTasha Tillery-Smith 2021-03-11 13:31:38 UTC 
Statement:

This issue doesn't affected any versions of OpenSSH packaged and shipped with Red Hat Enterprise Linux 6, 7 and 8. The issue was introduced in OpenSSH 8.2 while the most recent OpenSSH version available for Red Hat Enterprise Linux 8 is based on OpenSSH  8.0.
Comment 11 Marco Benatto 2021-03-12 18:32:32 UTC 
Upstream fix:
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568db

The double free happens on ssh-agent
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