Memory Management Flaw in libssh Versions Impacting Secure Shell Protocols
CVE-2021-3634

6.5MEDIUM

Key Information:

Vendor

Libssh

Status
Libssh
Vendor
CVE Published:
31 August 2021

What is CVE-2021-3634?

A vulnerability exists in libssh versions prior to 0.9.6 due to improper management of session identifiers during SSH protocol key re-exchange. The flawed memory handling allows the session_id buffer to retain previous values, leading to potential issues when a new secret_hash of differing size is created. This misalignment can compromise the integrity of secure sessions, allowing attackers to exploit the SSH protocol more effectively if not addressed.

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Affected Version(s)

libssh libssh 0.9.6

References

https://bugzilla.redhat.com/show_bug.cgi?id=1978810
https://www.debian.org/security/2021/dsa-4965
vendor-advisory
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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