CVE Vulnerabilities

CVE-2017-12934

Use After Free

Published: Aug 18, 2017 | Modified: Apr 20, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
8.1 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
LOW

ext/standard/var_unserializer.re in PHP 7.0.x before 7.0.21 and 7.1.x before 7.1.7 is prone to a heap use after free while unserializing untrusted data, related to the zval_get_type function in Zend/zend_types.h. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Name Vendor Start Version End Version
Php Php 7.0.0 (including) 7.0.0 (including)
Php Php 7.0.1 (including) 7.0.1 (including)
Php Php 7.0.2 (including) 7.0.2 (including)
Php Php 7.0.3 (including) 7.0.3 (including)
Php Php 7.0.4 (including) 7.0.4 (including)
Php Php 7.0.5 (including) 7.0.5 (including)
Php Php 7.0.6 (including) 7.0.6 (including)
Php Php 7.0.7 (including) 7.0.7 (including)
Php Php 7.0.8 (including) 7.0.8 (including)
Php Php 7.0.9 (including) 7.0.9 (including)
Php Php 7.0.10 (including) 7.0.10 (including)
Php Php 7.0.11 (including) 7.0.11 (including)
Php Php 7.0.12 (including) 7.0.12 (including)
Php Php 7.0.13 (including) 7.0.13 (including)
Php Php 7.0.14 (including) 7.0.14 (including)
Php Php 7.0.15 (including) 7.0.15 (including)
Php Php 7.0.16 (including) 7.0.16 (including)
Php Php 7.0.17 (including) 7.0.17 (including)
Php Php 7.0.18 (including) 7.0.18 (including)
Php Php 7.0.19 (including) 7.0.19 (including)
Php Php 7.0.20 (including) 7.0.20 (including)
Php Php 7.1.0 (including) 7.1.0 (including)
Php Php 7.1.1 (including) 7.1.1 (including)
Php Php 7.1.2 (including) 7.1.2 (including)
Php Php 7.1.3 (including) 7.1.3 (including)
Php Php 7.1.4 (including) 7.1.4 (including)
Php Php 7.1.5 (including) 7.1.5 (including)
Php Php 7.1.6 (including) 7.1.6 (including)
Red Hat Software Collections for Red Hat Enterprise Linux 6 RedHat rh-php70-php-0:7.0.27-1.el6 *
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS RedHat rh-php70-php-0:7.0.27-1.el6 *
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat rh-php70-php-0:7.0.27-1.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS RedHat rh-php70-php-0:7.0.27-1.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS RedHat rh-php70-php-0:7.0.27-1.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS RedHat rh-php70-php-0:7.0.27-1.el7 *
Php7.0 Ubuntu upstream *
Php7.1 Ubuntu upstream *

Potential Mitigations

References