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Integer Overflow or Wraparound Affecting openssh package, versions <1:8.1p1-1

low

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.05% (17th percentile)
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NVD
7.8 high
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Red Hat
8.8 high

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  • Snyk ID SNYK-DEBIAN11-OPENSSH-525307
  • published 9 Oct 2019
  • disclosed 9 Oct 2019
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Introduced: 9 Oct 2019

CVE-2019-16905 Open this link in a new tab
CWE-190 Open this link in a new tab

How to fix?

Upgrade Debian:11 openssh to version 1:8.1p1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.