Vulnerability Monitor

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CVE-2017-8923

The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.

Published

2017-05-12T20:29:00.500

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	php	php	< 7.4.24	Yes
Application	php	php	< 8.0.11	Yes

References

http://www.securityfocus.com/bid/98518 Third Party Advisory, VDB Entry ([email protected])
https://bugs.php.net/bug.php?id=74577 Exploit, Issue Tracking, Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/98518 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://bugs.php.net/bug.php?id=74577 Exploit, Issue Tracking, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20241227-0007/ (af854a3a-2127-422b-91ae-364da2661108)