Client memory disclosure via unchecked nonce generation
Published Jul 22, 2023 · Updated Oct 15, 2024
Information disclosure in PHP 8.0 before 8.0.29, 8.1 before 8.1.20, and 8.2 before 8.2.7 allows remote attackers to read 31 bits of client stack memory. In ext/soap/php_http.c, the SOAP HTTP Digest path neither checks php_random_bytes_throw() for failure nor uses enough nonce bytes, then hashes and transmits an uninitialized or guessable client nonce. Exploitation requires a SOAP client to authenticate to an attacker-controlled server; generator failure exposes stack bits, while the 31-bit nonce space facilitates password reversal.
Summary
What happened
Information disclosure in PHP 8.0 before 8.0.29, 8.1 before 8.1.20, and 8.2 before 8.2.7 allows remote attackers to read 31 bits of client stack memory. In ext/soap/php_http.c, the SOAP HTTP Digest path neither checks php_random_bytes_throw() for failure nor uses enough nonce bytes, then hashes and transmits an uninitialized or guessable client nonce. Exploitation requires a SOAP client to authenticate to an attacker-controlled server; generator failure exposes stack bits, while the 31-bit nonce space facilitates password reversal.
The record
- CVE
- CVE-2023-3247
- Published
- Jul 22, 2023
- Updated
- Oct 15, 2024
- Vendor
- The PHP Group
- Product
- PHP
- Classifications
- CWE-252, CWE-330, T1110.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 22, 2023CVE publishedPublication date reported by the CVE source.
- Oct 15, 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=8.0.* <8.0.29
- Affected versionversion=8.1.* <8.1.20
- Affected versionversion=8.2.* <8.2.7
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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