| 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) |
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) | 5.6.39+dfsg-0+deb8u1 | fixed | |
| php7.0 (PTS) | stretch | 7.0.30-0+deb9u1 | fixed |
| stretch (security) | 7.0.33-0+deb9u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| 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 |
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