CVE-2021-4217: Null Pointer Dereference
First published: Mon Jan 24 2022(Updated: )
A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Unzip Project Unzip | =6.0 | |
| Fedoraproject Fedora | =35 | |
| Redhat Enterprise Linux | =6.0 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| debian/unzip | <=6.0-26+deb11u1<=6.0-28 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-4217
- https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077
- https://bugzilla.redhat.com/show_bug.cgi?id=2044583
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2046940
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4217
- https://nvd.nist.gov/vuln/detail/CVE-2021-4217
- https://launchpad.net/bugs/cve/CVE-2021-4217
- https://security-tracker.debian.org/tracker/CVE-2021-4217
- https://ubuntu.com/security/CVE-2021-4217
Frequently Asked Questions
What is CVE-2021-4217?
CVE-2021-4217 is a vulnerability in unzip that occurs due to improper handling of Unicode strings, leading to a null pointer dereference.
How does CVE-2021-4217 affect the software?
CVE-2021-4217 affects the unzip software versions 6.0, Fedora 35, Red Hat Enterprise Linux 6.0, 7.0, 8.0, and 9.0.
What is the severity of CVE-2021-4217?
CVE-2021-4217 has a severity value of 3.3, which is considered low.
How can an attacker exploit CVE-2021-4217?
An attacker can exploit CVE-2021-4217 by inputting a specially crafted zip file, which can lead to a crash or code execution.
Is there a fix for CVE-2021-4217?
Yes, there are fixes available for CVE-2021-4217. It is recommended to update to the latest version of unzip or apply the necessary patches provided by the respective vendors.
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