Stack-based buffer overflow in cracklib - CVE-2016-6318
Published: May 25, 2020
Vulnerability identifier: #VU28205
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-2016-6318
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the FascistGecosUser() function in lib/fascist.c when processing a long GECOS field, involving longbuffer. A remote unauthenticated attacker can trigger a stack-based buffer overflow via an overly long password string and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
cracklib
Gentoo Linux
Fedora
cracklib (Alpine package)
cracklib
Gentoo Linux
Fedora
cracklib (Alpine package)
cracklib
How to mitigate CVE-2016-6318
Install update from vendor's website.
cracklib - update to 2.9.7
cracklib (Alpine package) - update to 2.9.7-r0
cracklib - addressed in versions 2.9.6-4.fc24, 2.9.6-4.fc25
cracklib (Alpine package) - update to 2.9.7-r0
cracklib - addressed in versions 2.9.6-4.fc24, 2.9.6-4.fc25