Race Condition Affecting pam_ssh_agent_auth package, versions <0:0.10.3-2.16.71.amzn1


Severity

Recommended
low

Based on Amazon Linux security rating

    Threat Intelligence

    Exploit Maturity
    Mature
    EPSS
    2.37% (90th percentile)

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  • Snyk ID SNYK-AMZN201803-PAMSSHAGENTAUTH-1715205
  • published 27 Sep 2021
  • disclosed 17 Aug 2018

How to fix?

Upgrade Amazon-Linux:2018.03 pam_ssh_agent_auth to version 0:0.10.3-2.16.71.amzn1 or higher.
This issue was patched in ALAS-2018-1075.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pam_ssh_agent_auth package and not the pam_ssh_agent_auth package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.

CVSS Scores

version 3.1
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NVD

5.3 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    Low
  • Integrity (I)
    None
  • Availability (A)
    None
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SUSE

5.3 medium