Improper input validation in Samba - CVE-2019-14907

Vulnerability identifier: #VU24466

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-14907

CWE-ID: CWE-20

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of certain user-controlled string, if logging is enabled at level 3 or above. A remote attacker can send specially crafted data to the Samba DC and terminate Samba RPC server.

Samba
Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux Resilient Storage for x86_64
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Opensuse
Fedora
libtevent (Red Hat package)
libtdb (Red Hat package)
libtalloc (Red Hat package)
samba (Alpine package)
samba (Red Hat package)
samba (Ubuntu package)
openchange (Red Hat package)
samba
ctdb (Red Hat package)
RoboHelp

Install updates from vendor's website.

Samba - addressed in versions 4.9.18, 4.10.12, 4.11.5
libtevent (Red Hat package) - update to 0.10.0-4.el7rhgs
libtdb (Red Hat package) - update to 1.4.2-4.el7rhgs
libtalloc (Red Hat package) - update to 2.2.0-9.el7rhgs
samba (Alpine package) - update to 4.8.12-r2
samba (Red Hat package) - addressed in versions 4.11.2-13.el8, 4.11.6-104.el7rhgs
samba (Ubuntu package) - addressed in versions 2:4.3.11+dfsg-0ubuntu0.16.04.25, 2:4.7.6+dfsg~ubuntu-0ubuntu2.15, 2:4.10.0+dfsg-0ubuntu2.8, 2:4.10.7+dfsg-0ubuntu2.4
openchange (Red Hat package) - update to 2.3-24.el8
samba - addressed in versions 4.10.12-0.fc30, 4.10.13-0.fc30, 4.11.5-0.fc31, 4.11.6-0.fc31
ctdb (Red Hat package) - update to 4.10.16-5.el7

• https://www.samba.org/samba/security/CVE-2019-14907.html

• Multiple vulnerabilities in Samba
• Ubuntu update for Samba
• OpenSUSE Linux update for samba
• Gentoo update for Samba
• Red Hat Gluster Storage 3 update for samba
• Red Hat Enterprise Linux 8 update for samba
• Improper input validation in samba (Alpine package)
• Red Hat Enterprise Linux Resilient Storage 7 update for samba
• Amazon Linux AMI update for samba
• Fedora 31 update for samba
• Fedora 30 update for samba
• Fedora 30 update for samba
• Fedora 31 update for samba