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Out-of-bounds Write Affecting libssh2 package, versions <0:1.4.3-12.amzn2.2

Severity

 Recommended
0.0
high
0
10

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    0.33% (72nd percentile)

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  • Snyk ID SNYK-AMZN2-LIBSSH2-1669994
  • published 27 Sep 2021
  • disclosed 25 Mar 2019
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Introduced: 25 Mar 2019

CVE-2019-3857 Open this link in a new tab
CWE-787 Open this link in a new tab
CWE-190 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2 libssh2 to version 0:1.4.3-12.amzn2.2 or higher.
This issue was patched in ALAS2-2019-1199.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh2 package and not the libssh2 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

References

CVSS Scores

version 3.1
Expand this section

NVD

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