NULL pointer dereference in UnZip - CVE-2021-4217

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Main Vulnerability Database Vulnerabilities #VU68298

NULL pointer dereference in UnZip - CVE-2021-4217

Published: October 13, 2022


Vulnerability identifier: #VU68298
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-4217
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 in unzip when handling Unicode strings. A remote attacker can trick the victim to open a specially crafted archive and perform a denial of service (DoS) attack.


Affected software

UnZip
Amazon Linux AMI
Ubuntu
openEuler
cflinuxfs3
Voice Gateway
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data
IBM Tivoli Application Dependency Discovery Manager
unzip (Ubuntu package)
unzip
unzip-debugsource
unzip-help
unzip-debuginfo

How to mitigate CVE-2021-4217

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

cflinuxfs3 - update to 0.328.0
Voice Gateway - update to 1.0.8.12
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data - update to 5.3
IBM Tivoli Application Dependency Discovery Manager - update to 7.3.0.10
unzip (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 6.0-21ubuntu1.2, 6.0-25ubuntu1.1, 6.0-26ubuntu3.1, 6.0-28ubuntu4.1
unzip - update to 6.0-47
unzip-debugsource - update to 6.0-47
unzip-help - update to 6.0-47
unzip-debuginfo - update to 6.0-47
unzip - update to 6.0-57

External References

Related Security Bulletins