Null Pointer Dereference in PHP Session Upload Progress
Vulnerability Description
In PHP versions 7.2.x below 7.2.28, 7.3.x below 7.3.15 and 7.4.x below 7.4.3, when using file upload functionality, if upload progress tracking is enabled, but session.upload_progress.cleanup is set to 0 (disabled), and the file upload fails, the upload procedure would try to clean up data that does not exist and encounter null pointer dereference, which would likely lead to a crash.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Reported by ryat@php.net
References
- https://bugs.php.net/bug.php?id=79221
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00023.html
- https://security.gentoo.org/glsa/202003-57
- https://lists.debian.org/debian-lts-announce/2020/03/msg00034.html
- https://usn.ubuntu.com/4330-1/
- https://www.debian.org/security/2020/dsa-4717
- https://www.debian.org/security/2020/dsa-4719
- https://www.tenable.com/security/tns-2021-14
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