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Debian DSA-5082-1 : php7.4 - security update

critical Nessus Plugin ID 158202

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5082 advisory.

 - 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. (CVE-2021-21707)

 - In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.
 (CVE-2021-21708)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the php7.4 packages.

For the stable distribution (bullseye), these problems have been fixed in version 7.4.28-1+deb11u1.

See Also

https://security-tracker.debian.org/tracker/source-package/php7.4

https://www.debian.org/security/2022/dsa-5082

https://security-tracker.debian.org/tracker/CVE-2021-21707

https://security-tracker.debian.org/tracker/CVE-2021-21708

https://packages.debian.org/source/bullseye/php7.4

Plugin Details

Severity: Critical

ID: 158202

File Name: debian_DSA-5082.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2/21/2022

Updated: 11/7/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-21708

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libapache2-mod-php7.4, p-cpe:/a:debian:debian_linux:libphp7.4-embed, p-cpe:/a:debian:debian_linux:php7.4, p-cpe:/a:debian:debian_linux:php7.4-bcmath, p-cpe:/a:debian:debian_linux:php7.4-bz2, p-cpe:/a:debian:debian_linux:php7.4-cgi, p-cpe:/a:debian:debian_linux:php7.4-cli, p-cpe:/a:debian:debian_linux:php7.4-common, p-cpe:/a:debian:debian_linux:php7.4-curl, p-cpe:/a:debian:debian_linux:php7.4-dba, p-cpe:/a:debian:debian_linux:php7.4-dev, p-cpe:/a:debian:debian_linux:php7.4-enchant, p-cpe:/a:debian:debian_linux:php7.4-fpm, p-cpe:/a:debian:debian_linux:php7.4-gd, p-cpe:/a:debian:debian_linux:php7.4-gmp, p-cpe:/a:debian:debian_linux:php7.4-imap, p-cpe:/a:debian:debian_linux:php7.4-interbase, p-cpe:/a:debian:debian_linux:php7.4-intl, p-cpe:/a:debian:debian_linux:php7.4-json, p-cpe:/a:debian:debian_linux:php7.4-ldap, p-cpe:/a:debian:debian_linux:php7.4-mbstring, p-cpe:/a:debian:debian_linux:php7.4-mysql, p-cpe:/a:debian:debian_linux:php7.4-odbc, p-cpe:/a:debian:debian_linux:php7.4-opcache, p-cpe:/a:debian:debian_linux:php7.4-pgsql, p-cpe:/a:debian:debian_linux:php7.4-phpdbg, p-cpe:/a:debian:debian_linux:php7.4-pspell, p-cpe:/a:debian:debian_linux:php7.4-readline, p-cpe:/a:debian:debian_linux:php7.4-snmp, p-cpe:/a:debian:debian_linux:php7.4-soap, p-cpe:/a:debian:debian_linux:php7.4-sqlite3, p-cpe:/a:debian:debian_linux:php7.4-sybase, p-cpe:/a:debian:debian_linux:php7.4-tidy, p-cpe:/a:debian:debian_linux:php7.4-xml, p-cpe:/a:debian:debian_linux:php7.4-xmlrpc, p-cpe:/a:debian:debian_linux:php7.4-xsl, p-cpe:/a:debian:debian_linux:php7.4-zip, cpe:/o:debian:debian_linux:11.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/18/2022

Vulnerability Publication Date: 11/29/2021

Reference Information

CVE: CVE-2021-21707, CVE-2021-21708

IAVA: 2021-A-0566-S