OS Command Injection in rssh - CVE-2019-3463
Published: February 4, 2019
Vulnerability identifier: #VU17363
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-3463
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper validation in the rsync support. A remote unauthenticated attacker can bypass the rsync support and execute arbitrary OS commands on the target system and perform only scp, sftp, cvs, svnserve (Subversion), rdist and/or rsync operations.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
rssh
Gentoo Linux
Amazon Linux AMI
Fedora
rssh (Debian package)
rssh (Ubuntu package)
rssh
Gentoo Linux
Amazon Linux AMI
Fedora
rssh (Debian package)
rssh (Ubuntu package)
rssh
How to mitigate CVE-2019-3463
Install updates from vendor's website.
rssh (Debian package) - update to 2.3.4-5+deb9u2.
rssh (Ubuntu package) - addressed in versions 2.3.4-4+deb8u2ubuntu0.14.04.2, 2.3.4-4+deb8u2ubuntu0.16.04.2, 2.3.4-7ubuntu0.1, 2.3.4-8ubuntu0.2
rssh - addressed in versions 2.3.4-15.el6, 2.3.4-15.el7, 2.3.4-15.fc29, 2.3.4-15.fc30, 2.3.4-15.fc31
rssh (Ubuntu package) - addressed in versions 2.3.4-4+deb8u2ubuntu0.14.04.2, 2.3.4-4+deb8u2ubuntu0.16.04.2, 2.3.4-7ubuntu0.1, 2.3.4-8ubuntu0.2
rssh - addressed in versions 2.3.4-15.el6, 2.3.4-15.el7, 2.3.4-15.fc29, 2.3.4-15.fc30, 2.3.4-15.fc31