Integer Overflow or Wraparound Affecting libssh2 package, versions <0:1.4.3-12.amzn2.2.3


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    0.41% (75th percentile)

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  • Snyk ID SNYK-AMZN2-LIBSSH2-1687749
  • published 27 Sep 2021
  • disclosed 21 Oct 2019

How to fix?

Upgrade Amazon-Linux:2 libssh2 to version 0:1.4.3-12.amzn2.2.3 or higher.
This issue was patched in ALAS2-2020-1531.

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.

In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

CVSS Scores

version 3.1
Expand this section

NVD

8.1 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)
    None
  • Availability (A)
    High