Null Byte Interaction Error (Poison Null Byte) Affecting php55-php package, versions <0:5.5.21-4.el7


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
3.55% (92nd percentile)

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  • Snyk IDSNYK-RHEL7-PHP55PHP-4655887
  • published26 Jul 2021
  • disclosed14 May 2015

Introduced: 14 May 2015

CVE-2015-4026  (opens in a new tab)
CWE-626  (opens in a new tab)

How to fix?

Upgrade RHEL:7 php55-php to version 0:5.5.21-4.el7 or higher.
This issue was patched in RHSA-2015:1186.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php55-php package and not the php55-php package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

The pcntl_exec implementation in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 truncates a pathname upon encountering a \x00 character, which might allow remote attackers to bypass intended extension restrictions and execute files with unexpected names via a crafted first argument. NOTE: this vulnerability exists because of an incomplete fix for CVE-2006-7243.

CVSS Scores

version 3.1