PT-2018-2669 · Libssh2+5 · Libssh2+5

Chris Coulson · Published 2018-12-03 · Updated 2024-06-15 · CVE-2019-3857

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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

Description The issue is related to an integer overflow flaw in the way SSH MSG CHANNEL REQUEST packets with an exit signal are parsed. This could lead to an out of bounds write, allowing a remote attacker who compromises a SSH server to potentially execute code on the client system when a user connects to the server. The vulnerability can be exploited by a remote attacker to execute arbitrary code in the client system upon connection to the server.

Recommendations For libssh2 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 can be applied.

Exploit

Fix

Integer Overflow

Memory Corruption

Weakness Enumeration

CWE-190

CWE-787

Related Identifiers

ALT-PU-2019-1501

BDU:2019-01304

BDU:2019-03917

CESA-2019_0679

CESA-2019_1175

CESA-2019_1652

CVE-2019-3857

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-2019:0679

RHSA-2019:1175

RHSA-2019:1652

RHSA-2019:1791

RHSA-2019:1943

RHSA-2019:2399

RHSA-2019_0679

RHSA-2019_1175

RHSA-2019_1652

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 · 167

• 🔥❌ 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://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
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20815 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857 · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2019:1109-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:13997-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2019-1175.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-3857 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:3551-1 · Vendor Advisory