NULL pointer dereference in ZenLib - CVE-2020-36646
Published: May 1, 2023
Vulnerability identifier: #VU75610
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-36646
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the Ztring::Date_From_Seconds_1970_Local() function of the file Source/ZenLib/Ztring.cpp. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
ZenLib
Ubuntu
libzen-dev (Ubuntu package)
libzen0v5 (Ubuntu package)
libzen0 (Ubuntu package)
Ubuntu
libzen-dev (Ubuntu package)
libzen0v5 (Ubuntu package)
libzen0 (Ubuntu package)
How to mitigate CVE-2020-36646
Install updates from vendor's website.
ZenLib - update to 0.4.39
libzen-dev (Ubuntu package) - addressed in versions Ubuntu Pro, 0.4.37-1ubuntu0.18.04.1, 0.4.37-1ubuntu0.20.04.1
libzen0v5 (Ubuntu package) - addressed in versions Ubuntu Pro, 0.4.37-1ubuntu0.18.04.1, 0.4.37-1ubuntu0.20.04.1
libzen0 (Ubuntu package) - update to Ubuntu Pro
libzen-dev (Ubuntu package) - addressed in versions Ubuntu Pro, 0.4.37-1ubuntu0.18.04.1, 0.4.37-1ubuntu0.20.04.1
libzen0v5 (Ubuntu package) - addressed in versions Ubuntu Pro, 0.4.37-1ubuntu0.18.04.1, 0.4.37-1ubuntu0.20.04.1
libzen0 (Ubuntu package) - update to Ubuntu Pro