Memory disclosure via signed EBCDIC array index
Published Apr 27, 2020 · Updated Sep 17, 2024
Out-of-bounds read in PHP 7.2 before 7.2.30, 7.3 before 7.3.17, and 7.4 before 7.4.5 allows remote attackers to read process memory. In php_url_decode, php_htoi output is cast to signed char and used directly as an index into the 256-byte os_toebcdic table, so values above 0x7f address memory before the table. The flaw is reachable only in uncommon builds compiled with CHARSET_EBCDIC and when attacker-controlled percent-encoded input reaches urldecode().
Summary
What happened
Out-of-bounds read in PHP 7.2 before 7.2.30, 7.3 before 7.3.17, and 7.4 before 7.4.5 allows remote attackers to read process memory. In php_url_decode, php_htoi output is cast to signed char and used directly as an index into the 256-byte os_toebcdic table, so values above 0x7f address memory before the table. The flaw is reachable only in uncommon builds compiled with CHARSET_EBCDIC and when attacker-controlled percent-encoded input reaches urldecode().
The record
- CVE
- CVE-2020-7067
- Published
- Apr 27, 2020
- Updated
- Sep 17, 2024
- Vendor
- The PHP Group
- Product
- PHP
- Classifications
- CWE-196, CWE-125, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 27, 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 below 7.2.30
- Affected versionversion=7.3.x below 7.3.17 and 7.4.x below 7.4.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- Malformed percent-encoding test scriptproof of concept · unverified
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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