CVE-2017-12934: Use After Free
First published: Thu Jul 06 2017(Updated: )
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. Upstream bug: <a href="https://bugs.php.net/bug.php?id=74101">https://bugs.php.net/bug.php?id=74101</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/php7.0 | ||
| debian/php7.1 | ||
| redhat/php | <7.0.21 | 7.0.21 |
| redhat/php | <7.1.7 | 7.1.7 |
| PHP | <7.0.21 | 7.0.21 |
| PHP | =7.0.0 | |
| PHP | =7.0.1 | |
| PHP | =7.0.2 | |
| PHP | =7.0.3 | |
| PHP | =7.0.4 | |
| PHP | =7.0.5 | |
| PHP | =7.0.6 | |
| PHP | =7.0.7 | |
| PHP | =7.0.8 | |
| PHP | =7.0.9 | |
| PHP | =7.0.10 | |
| PHP | =7.0.11 | |
| PHP | =7.0.12 | |
| PHP | =7.0.13 | |
| PHP | =7.0.14 | |
| PHP | =7.0.15 | |
| PHP | =7.0.16 | |
| PHP | =7.0.17 | |
| PHP | =7.0.18 | |
| PHP | =7.0.19 | |
| PHP | =7.0.20 | |
| PHP | =7.1.0 | |
| PHP | =7.1.1 | |
| PHP | =7.1.2 | |
| PHP | =7.1.3 | |
| PHP | =7.1.4 | |
| PHP | =7.1.5 | |
| PHP | =7.1.6 |
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Reference Links
- https://bugs.php.net/bug.php?id=74101
- https://security-tracker.debian.org/tracker/CVE-2017-12934
- http://php.net/ChangeLog-7.php
- http://www.securityfocus.com/bid/100428
- https://access.redhat.com/errata/RHSA-2018:1296
- https://www.debian.org/security/2018/dsa-4080
- https://www.php.net/ChangeLog-7.php#7.0.21 (Advisory)
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1484840
- http://php.net/manual/en/function.unserialize.php
- https://bugzilla.redhat.com/show_bug.cgi?id=1484839
- https://www.zdnet.com/article/wordpress-vulnerability-affects-a-third-of-most-popular-websites-online/
Frequently Asked Questions
What is the severity of CVE-2017-12934?
CVE-2017-12934 has a critical severity rating due to the potential impact on the integrity of PHP when unserializing untrusted data.
How do I fix CVE-2017-12934?
To fix CVE-2017-12934, upgrade PHP to version 7.0.21 or newer, or 7.1.7 or newer.
What versions of PHP are affected by CVE-2017-12934?
CVE-2017-12934 affects PHP versions 7.0.x before 7.0.21 and 7.1.x before 7.1.7.
What type of vulnerability is CVE-2017-12934?
CVE-2017-12934 is a heap use-after-free vulnerability related to data unserialization in PHP.
Can CVE-2017-12934 be exploited remotely?
Yes, CVE-2017-12934 can be exploited remotely by an attacker through untrusted data during the unserialization process.
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