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.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Unzip | Unzip_project | 6.0 (including) | 6.0 (including) |
| Unzip | Ubuntu | bionic | * |
| Unzip | Ubuntu | devel | * |
| Unzip | Ubuntu | esm-infra-legacy/trusty | * |
| Unzip | Ubuntu | esm-infra/bionic | * |
| Unzip | Ubuntu | esm-infra/focal | * |
| Unzip | Ubuntu | esm-infra/xenial | * |
| Unzip | Ubuntu | focal | * |
| Unzip | Ubuntu | impish | * |
| Unzip | Ubuntu | jammy | * |
| Unzip | Ubuntu | kinetic | * |
| Unzip | Ubuntu | lunar | * |
| Unzip | Ubuntu | mantic | * |
| Unzip | Ubuntu | noble | * |
| Unzip | Ubuntu | trusty | * |
| Unzip | Ubuntu | trusty/esm | * |
| Unzip | Ubuntu | xenial | * |
Potential Mitigations
References
- 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://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