CVE-2016-4538

Name	CVE-2016-4538
Description	The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_, _one_, or _two_ global variable, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-628-1, DSA-3602-1
NVD severity	high

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
php7.0 (PTS)	stretch	7.0.33-0+deb9u8	fixed
	stretch (security)	7.0.33-0+deb9u12	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
php5	source	wheezy	5.4.45-0+deb7u5	DLA-628-1
php5	source	jessie	5.6.22+dfsg-0+deb8u1	DSA-3602-1
php5	source	(unstable)	5.6.21+dfsg-1
php7.0	source	(unstable)	7.0.6-1

Notes

https://bugs.php.net/bug.php?id=72093
https://git.php.net/?p=php-src.git;a=commit;h=d650063a0457aec56364e4005a636dc6c401f9cd
Fixed in 7.0.6, 5.6.21, 5.5.35
https://www.openwall.com/lists/oss-security/2016/05/05/21