CVE-2016-4538

php: bcpowmod accepts negative scale causing heap buffer overflow corrupting _one_ definition

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La función bcpowmod en ext/bcmath/bcmath.c en PHP en versiones anteriores a 5.5.35, 5.6.x en versiones anteriores a 5.6.21 y 7.x en versiones anteriores a 7.0.6 modifica ciertas estructuras de datos sin considerar si son copias de la variable global _zero_, _one_, o _two_, lo que permite a atacantes remotos provocar una denegación de servicio o posiblemente tener otro impacto no especificado a través de una llamada manipulada.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Attack Vector

Network

Attack Complexity

High

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-05-05 CVE Reserved
2016-05-22 CVE Published
2023-04-24 EPSS Updated
2024-08-06 CVE Updated
2024-08-06 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation
CWE-122: Heap-based Buffer Overflow

CAPEC

References (17)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2016/05/05/21	Mailing List
http://www.securityfocus.com/bid/90173	Vdb Entry
https://git.php.net/?p=php-src.git%3Ba=commit%3Bh=d650063a0457aec56364e4005a636dc6c401f9cd	X_refsource_confirm
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731	X_refsource_confirm
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149	X_refsource_confirm
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722	X_refsource_confirm

URL	Date	SRC
https://bugs.php.net/bug.php?id=72093	2024-08-06

URL	Date	SRC
http://php.net/ChangeLog-5.php	2023-11-07
http://php.net/ChangeLog-7.php	2023-11-07

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183736.html	2023-11-07
http://lists.opensuse.org/opensuse-updates/2016-05/msg00086.html	2023-11-07
http://lists.opensuse.org/opensuse-updates/2016-06/msg00027.html	2023-11-07
http://rhn.redhat.com/errata/RHSA-2016-2750.html	2023-11-07
http://www.debian.org/security/2016/dsa-3602	2023-11-07
https://security.gentoo.org/glsa/201611-22	2023-11-07
https://access.redhat.com/security/cve/CVE-2016-4538	2016-11-15
https://bugzilla.redhat.com/show_bug.cgi?id=1332860	2016-11-15

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				<= 5.5.33 Search vendor "Php" for product "Php" and version " <= 5.5.33"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.0 Search vendor "Php" for product "Php" and version "5.6.0"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.1 Search vendor "Php" for product "Php" and version "5.6.1"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.2 Search vendor "Php" for product "Php" and version "5.6.2"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.3 Search vendor "Php" for product "Php" and version "5.6.3"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.4 Search vendor "Php" for product "Php" and version "5.6.4"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.5 Search vendor "Php" for product "Php" and version "5.6.5"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.6 Search vendor "Php" for product "Php" and version "5.6.6"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.7 Search vendor "Php" for product "Php" and version "5.6.7"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.8 Search vendor "Php" for product "Php" and version "5.6.8"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.9 Search vendor "Php" for product "Php" and version "5.6.9"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.10 Search vendor "Php" for product "Php" and version "5.6.10"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.11 Search vendor "Php" for product "Php" and version "5.6.11"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.12 Search vendor "Php" for product "Php" and version "5.6.12"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.13 Search vendor "Php" for product "Php" and version "5.6.13"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.14 Search vendor "Php" for product "Php" and version "5.6.14"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.15 Search vendor "Php" for product "Php" and version "5.6.15"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.16 Search vendor "Php" for product "Php" and version "5.6.16"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.17 Search vendor "Php" for product "Php" and version "5.6.17"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.18 Search vendor "Php" for product "Php" and version "5.6.18"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.19 Search vendor "Php" for product "Php" and version "5.6.19"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				5.6.20 Search vendor "Php" for product "Php" and version "5.6.20"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				7.0.0 Search vendor "Php" for product "Php" and version "7.0.0"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				7.0.1 Search vendor "Php" for product "Php" and version "7.0.1"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				7.0.2 Search vendor "Php" for product "Php" and version "7.0.2"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				7.0.3 Search vendor "Php" for product "Php" and version "7.0.3"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				7.0.4 Search vendor "Php" for product "Php" and version "7.0.4"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				7.0.5 Search vendor "Php" for product "Php" and version "7.0.5"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				24 Search vendor "Fedoraproject" for product "Fedora" and version "24"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				42.1 Search vendor "Opensuse" for product "Leap" and version "42.1"		-		Affected