Memory corruption via PHAR directory entry bounds errors
Published Aug 11, 2023 · Updated Feb 13, 2025
Stack buffer overflow in PHP 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 allows attackers to corrupt memory. In phar_dir_read(), a directory-entry name as long as php_stream_dirent makes the code copy the full name and write a NUL byte two bytes beyond the stack buffer; incorrect termination also exposes adjacent stack data. PHP must enumerate a crafted PHAR directory, after which the out-of-bounds write and stack disclosure can terminate the process or enable code execution.
Summary
What happened
Stack buffer overflow in PHP 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 allows attackers to corrupt memory. In phar_dir_read(), a directory-entry name as long as php_stream_dirent makes the code copy the full name and write a NUL byte two bytes beyond the stack buffer; incorrect termination also exposes adjacent stack data. PHP must enumerate a crafted PHAR directory, after which the out-of-bounds write and stack disclosure can terminate the process or enable code execution.
The record
- CVE
- CVE-2023-3824
- Published
- Aug 11, 2023
- Updated
- Feb 13, 2025
- Vendor
- The PHP Group
- Product
- PHP
- Classifications
- CWE-121, CWE-122, CWE-126, CWE-120, CWE-119, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2023CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.0.* <8.0.30
- Affected versionversion=8.1.* <8.1.22
- Affected versionversion=8.2.* <8.2.8
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream PHAR directory-entry reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo