Improper Input Validation Affecting php-mbstring package, versions <0:7.4.30-1.module+el8.7.0+15886+8e29b882


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.22% (62nd percentile)

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  • Snyk IDSNYK-CENTOS8-PHPMBSTRING-1958936
  • published24 Nov 2021
  • disclosed15 Nov 2021

Introduced: 15 Nov 2021

CVE-2021-21707  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Centos:8 php-mbstring to version 0:7.4.30-1.module+el8.7.0+15886+8e29b882 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-mbstring package and not the php-mbstring package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.

CVSS Scores

version 3.1