PT-2018-2668 · Libssh2+5 · Libssh2+5

Chris Coulson · Published 2018-12-03 · Updated 2024-06-15 · CVE-2019-3861

Positive Technologies (AI Summary)

CVSS v2.0

9.4

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:C

Name of the Vulnerable Software and Affected Versions libssh2 versions prior to 1.8.1

Description The issue is related to an out of bounds read flaw in the way SSH packets are parsed, specifically when the padding length value is greater than the packet length. This could allow a remote attacker who compromises a SSH server to cause a Denial of Service or read data in the client memory. The vulnerability is associated with errors in processing inconsistencies in the length parameter, which can be exploited by a remote attacker to gain unauthorized access to protected information or cause a service disruption.

Recommendations For versions prior to 1.8.1, update to version 1.8.1 or later to resolve the issue. As a temporary workaround, consider restricting access to SSH servers until the update is applied.

Exploit

Fix

DoS

Out of bounds Read

Weakness Enumeration

CWE-130

CWE-125

Related Identifiers

ALT-PU-2019-1501

BDU:2019-01303

BDU:2019-03865

CESA-2019_2136

CVE-2019-3861

DLA-1730-1

DSA-4431-1

MGASA-2019-0139

OPENSUSE-SU-2019:1109-1

OPENSUSE-SU-2019_1075-1

OPENSUSE-SU-2019_1109-1

OPENSUSE-SU-2020:2126-1

OPENSUSE-SU-2020:2129-1

OPENSUSE-SU-2020_2126-1

OPENSUSE-SU-2020_2129-1

OPENSUSE-SU-2024:10999-1

RHSA-2019:2136

RHSA-2019_2136

SUSE-SU-2019:0655-1

SUSE-SU-2019:13982-1

SUSE-SU-2019:13997-1

SUSE-SU-2020:3551-1

USN-5308-1

Affected Products

Alt Linux

Centos

Red Hat

Suse

Ubuntu

Libssh2

References · 135

• 🔥❌ https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498 · Exploit, Deleted
• https://bdu.fstec.ru/vul/2022-05961 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3861 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3860 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2019-3861 · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-01304 · Security Note
• https://ubuntu.com/security/CVE-2019-3862 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-03898 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2019:1109-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:13997-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:3551-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-3857 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-03917 · Security Note