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


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.12% (49th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about Improper Input Validation vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-DEBIAN12-OPENSSH-1555772
  • published2 Jun 2020
  • disclosed1 Jun 2020

Introduced: 1 Jun 2020

CVE-2020-12062  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Debian:12 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:12 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.

CVSS Scores

version 3.1