Debian DSA-4993-1 : php7.3 - security update

high Nessus Plugin ID 154428

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 10 host has packages installed that are affected by a vulnerability as referenced in the dsa-4993 advisory.

- In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower- privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
(CVE-2021-21703)

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 php7.3 packages.

See Also

https://security-tracker.debian.org/tracker/source-package/php7.3

https://www.debian.org/security/2021/dsa-4993

https://security-tracker.debian.org/tracker/CVE-2021-21703

https://packages.debian.org/source/buster/php7.3

Plugin Details

Severity: High

ID: 154428

File Name: debian_DSA-4993.nasl

Version: 1.5

Type: local

Agent: unix

Published: 10/26/2021

Updated: 10/11/2022

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

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-21703

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libapache2-mod-php7.3, p-cpe:/a:debian:debian_linux:libphp7.3-embed, p-cpe:/a:debian:debian_linux:php7.3, p-cpe:/a:debian:debian_linux:php7.3-bcmath, p-cpe:/a:debian:debian_linux:php7.3-bz2, p-cpe:/a:debian:debian_linux:php7.3-cgi, p-cpe:/a:debian:debian_linux:php7.3-cli, p-cpe:/a:debian:debian_linux:php7.3-common, p-cpe:/a:debian:debian_linux:php7.3-curl, p-cpe:/a:debian:debian_linux:php7.3-dba, p-cpe:/a:debian:debian_linux:php7.3-dev, p-cpe:/a:debian:debian_linux:php7.3-enchant, p-cpe:/a:debian:debian_linux:php7.3-fpm, p-cpe:/a:debian:debian_linux:php7.3-gd, p-cpe:/a:debian:debian_linux:php7.3-gmp, p-cpe:/a:debian:debian_linux:php7.3-imap, p-cpe:/a:debian:debian_linux:php7.3-interbase, p-cpe:/a:debian:debian_linux:php7.3-intl, p-cpe:/a:debian:debian_linux:php7.3-json, p-cpe:/a:debian:debian_linux:php7.3-ldap, p-cpe:/a:debian:debian_linux:php7.3-mbstring, p-cpe:/a:debian:debian_linux:php7.3-mysql, p-cpe:/a:debian:debian_linux:php7.3-odbc, p-cpe:/a:debian:debian_linux:php7.3-opcache, p-cpe:/a:debian:debian_linux:php7.3-pgsql, p-cpe:/a:debian:debian_linux:php7.3-phpdbg, p-cpe:/a:debian:debian_linux:php7.3-pspell, p-cpe:/a:debian:debian_linux:php7.3-readline, p-cpe:/a:debian:debian_linux:php7.3-recode, p-cpe:/a:debian:debian_linux:php7.3-snmp, p-cpe:/a:debian:debian_linux:php7.3-soap, p-cpe:/a:debian:debian_linux:php7.3-sqlite3, p-cpe:/a:debian:debian_linux:php7.3-sybase, p-cpe:/a:debian:debian_linux:php7.3-tidy, p-cpe:/a:debian:debian_linux:php7.3-xml, p-cpe:/a:debian:debian_linux:php7.3-xmlrpc, p-cpe:/a:debian:debian_linux:php7.3-xsl, p-cpe:/a:debian:debian_linux:php7.3-zip, cpe:/o:debian:debian_linux:10.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/25/2021

Vulnerability Publication Date: 10/25/2021

Reference Information

CVE: CVE-2021-21703

IAVA: 2021-A-0503-S