Information disclosure or crash via unchecked back-reference
Published Feb 10, 2020 · Updated Sep 17, 2024
Out-of-bounds read in PHP 7.2.x before 7.2.27, 7.3.x before 7.3.14, and 7.4.x before 7.4.2 allows attackers to crash PHP. php_strip_tags_ex dereferences the byte before its input pointer without first ensuring that the pointer has advanced beyond the buffer start. Reachability requires consuming code to pass attacker-controlled stream data to fgetss; the over-read exposes adjacent memory or terminates the PHP process.
Summary
What happened
Out-of-bounds read in PHP 7.2.x before 7.2.27, 7.3.x before 7.3.14, and 7.4.x before 7.4.2 allows attackers to crash PHP. php_strip_tags_ex dereferences the byte before its input pointer without first ensuring that the pointer has advanced beyond the buffer start. Reachability requires consuming code to pass attacker-controlled stream data to fgetss; the over-read exposes adjacent memory or terminates the PHP process.
The record
- CVE
- CVE-2020-7059
- Published
- Feb 10, 2020
- Updated
- Sep 17, 2024
- Vendor
- The PHP Group
- Product
- PHP
- Classifications
- CWE-125
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 10, 2020CVE publishedPublication date reported by the CVE source.
- Sep 17, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.2.x <7.2.27
- Affected versionversion=7.3.x <7.3.14
- Affected versionversion=7.4.x <7.4.2
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 fgetss crash 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
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