The unserialize implementation in ext/standard/var.c in PHP 7.x before 7.0.14 allows remote attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact via crafted serialized data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-6834.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| http://www.openwall.com/lists/oss-security/2016/12/12/2 | mailing list |
| http://www.php.net/ChangeLog-7.php | patch release notes |
| https://github.com/php/php-src/commit/b2af4e8868726a040234de113436c6e4f6372d17 | patch |
| https://access.redhat.com/errata/RHSA-2018:1296 | vendor advisory |
| https://bugs.php.net/bug.php?id=72978 | issue tracking exploit |
| http://lists.opensuse.org/opensuse-updates/2017-01/msg00034.html | vendor advisory |
| http://www.securityfocus.com/bid/94849 | vdb entry |