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Access Restriction Bypass Affecting openssh package, versions <1:6.4p1-1

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required

    Threat Intelligence

    EPSS 0.42% (74th percentile)
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NVD
5.5 medium
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Red Hat
6.3 medium

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  • Snyk ID SNYK-DEBIAN11-OPENSSH-528120
  • published 8 Nov 2013
  • disclosed 8 Nov 2013
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Introduced: 8 Nov 2013

CVE-2013-4548 Open this link in a new tab
CWE-264 Open this link in a new tab

How to fix?

Upgrade Debian:11 openssh to version 1:6.4p1-1 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.

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.