var-201910-0984
Vulnerability from variot

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH. OpenSSH Contains an integer overflow vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201911-01


                                       https://security.gentoo.org/

Severity: Normal Title: OpenSSH: Integer overflow Date: November 07, 2019 Bugs: #697046 ID: 201911-01


Synopsis

An integer overflow in OpenSSH might allow an attacker to execute arbitrary code.

Background

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

NOTE: This USE flag is disabled by default!

Impact

A remote attacker could connect to a vulnerable OpenSSH server using a special crafted XMSS key possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

Workaround

Disable XMSS key type.

Resolution

All OpenSSH users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot -v ">=net-misc/openssh/openssh-8.0_p1-r4"

References

[ 1 ] CVE-2019-16905 https://nvd.nist.gov/vuln/detail/CVE-2019-16905

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

https://security.gentoo.org/glsa/201911-01

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.

License

Copyright 2019 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5

Show details on source website


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