Out-of-bounds read in libssh2 - CVE-2019-3861

Vulnerability identifier: #VU18252

CSH Severity: Low

CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-3861

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when SSH packets with a padding length value greater than the packet length are parsed. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out of bounds read and gain access to sensitive information or perform denial of service attack.

libssh2
Arch Linux
FortiOS
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Slackware Linux
Opensuse
Fedora
libssh2 (Alpine package)
libssh2 (Debian package)
libssh2
IBM Tivoli Storage Manager
Flex System Chassis Management Module (CMM)
Dell EMC Unity VSA Operating Environment (OE)
Dell EMC Unity Operating Environment (OE)
Dell PowerProtect Cyber Recovery

Install update from vendor's website.

libssh2 - update to 1.8.1
libssh2 (Alpine package) - update to 1.8.1-r0
libssh2 (Debian package) - update to 1.7.0-1+deb9u1
FortiOS - addressed in versions 5.6.11, 6.0.7, 6.2.1
libssh2 - addressed in versions 1.8.1-1.fc28, 1.8.1-1.fc29, 1.8.2-1.fc30
Flex System Chassis Management Module (CMM) - update to 2pet18c-2.5.16c
Dell EMC Unity VSA Operating Environment (OE) - update to 5.0.0.0.5.116
Dell EMC Unity Operating Environment (OE) - update to 5.0.0.0.5.116
Dell PowerProtect Cyber Recovery - update to 18.1.1.2-8

• https://www.libssh2.org/CVE-2019-3861.html

• Multiple vulnerabilities in libssh2
• Debian update for libssh2
• Arch Linux update for libssh2
• Slackware Linux update for libssh2
• OpenSUSE Linux update for libssh2
• OpenSUSE Linux update for libssh2
• Red Hat update for libssh2
• FortiOS update for libssh2
• Out-of-bounds read in libssh2 (Alpine package)
• Multiple vulnerabilities in Dell EMC Cyber Recovery
• Multiple vulnerabilities in Dell EMC Unity Family
• Multiple vulnerabilities in IBM Flex System Chassis Management Module (CMM)
• Fedora 29 update for libssh2
• Fedora 28 update for libssh2
• Fedora 30 update for libssh2