Improper Input Validation Affecting openssh package, versions <1:8.3p1-1


low

Snyk CVSS

    Attack Complexity Low
    Integrity High

    Threat Intelligence

    EPSS 0.13% (47th percentile)
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NVD
7.5 high
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Red Hat
0 info

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  • Snyk ID SNYK-DEBIAN11-OPENSSH-570886
  • published 2 Jun 2020
  • disclosed 1 Jun 2020

How to fix?

Upgrade Debian:11 openssh to version 1:8.3p1-1 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 scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arbitrary files in the client's download directory by creating a crafted subdirectory anywhere on the remote server. The victim must use the command scp -rp to download a file hierarchy containing, anywhere inside, this crafted subdirectory. NOTE: the vendor points out that "this attack can achieve no more than a hostile peer is already able to achieve within the scp protocol" and "utimes does not fail under normal circumstances.