CVE-2016-4537

NameCVE-2016-4537
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-499-1, DSA-3602-1
NVD severityhigh (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
php5 (PTS)wheezy5.4.45-0+deb7u2vulnerable
wheezy (security)5.4.45-0+deb7u11fixed
jessie (security), jessie5.6.30+dfsg-0+deb8u1fixed
php7.0 (PTS)stretch7.0.19-1fixed
buster, sid7.0.26-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
php5source(unstable)5.6.21+dfsg-1high
php5sourcejessie5.6.22+dfsg-0+deb8u1highDSA-3602-1
php5sourcewheezy5.4.45-0+deb7u3highDLA-499-1
php7.0source(unstable)7.0.6-1high

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

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