CVE-2016-4537

Name	CVE-2016-4537
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 accepts a negative integer for the scale argument, 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-499-1, DSA-3602-1
NVD severity	high (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
php5 (PTS)	jessie	5.6.33+dfsg-0+deb8u1	fixed
	jessie (security)	5.6.38+dfsg-0+deb8u1	fixed
php7.0 (PTS)	stretch (security), stretch	7.0.30-0+deb9u1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
php5	source	(unstable)	5.6.21+dfsg-1	high
php5	source	jessie	5.6.22+dfsg-0+deb8u1	high	DSA-3602-1
php5	source	wheezy	5.4.45-0+deb7u3	high	DLA-499-1
php7.0	source	(unstable)	7.0.6-1	high

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
http://www.openwall.com/lists/oss-security/2016/05/05/21