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CVE-2016-4538

Publication date 6 May 2016

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
php5 16.04 LTS xenial Not in release
15.10 wily
Fixed 5.6.11+dfsg-1ubuntu3.4
14.04 LTS trusty
Fixed 5.5.9+dfsg-1ubuntu4.17
12.04 LTS precise
Fixed 5.3.10-1ubuntu3.23
php7.0 16.04 LTS xenial
Fixed 7.0.4-7ubuntu2.1
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release

Notes

sbeattie

Fixed in 7.0.6, 5.6.21, 5.5.35

mdeslaur

same commit as CVE-2016-4537

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
php5
php7.0

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references