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Gentoo: GLSA-202105-35 Moderate: OpenSSH Remote Code Execution Threat

gentoo
Calendar Grey May 26, 2021
Dist Gentoo Esm H88
Recent discoveries of OpenSSH security flaws in Gentoo Linux necessitate urgent measures to prevent possible external exploits.
Multiple vulnerabilities have been found in OpenSSH, the worst of which could allow a remote attacker to execute arbitrary code.

Summary

Multiple vulnerabilities have been discovered in OpenSSH. Please review the CVE identifiers referenced below for details.

Topics%20covered

Topics Covered

security advisory denial of service security update Gentoo remote code execution attack OpenSSH

Resolution

All OpenSSH users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/openssh-8.5_p1"

References

[ 1 ] CVE-2020-14145 https://nvd.nist.gov/vuln/detail/CVE-2020-14145 [ 2 ] CVE-2021-28041 https://nvd.nist.gov/vuln/detail/CVE-2021-28041

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202105-35
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: OpenSSH: Multiple vulnerabilities
Date: May 26, 2021
Bugs: #763048, #774090
ID: 202105-35

Topics%20covered

Topics Covered

security advisory denial of service security update Gentoo remote code execution attack OpenSSH

Synopsis

Multiple vulnerabilities have been found in OpenSSH, the worst of which could allow a remote attacker to execute arbitrary code.

Background

OpenSSH is a complete SSH protocol implementation that includes SFTP client and server support.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/openssh < 8.5_p1 >= 8.5_p1

Impact

===== A remote attacker, able to access the socket of the forwarding agent, might be able to execute arbitrary code with the privileges of the process or cause a Denial of Service condition. Furthermore, a remote attacker might conduct a man-in-the-middle attack targeting initial connection attempts where no host key for the server has been cached by client yet.

Workaround

There is no known workaround at this time.

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