Debian DLA-2776-1 : apache2 - LTS security update

critical Nessus Plugin ID 153842

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Synopsis

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

Description

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2776 advisory.

Several vulnerabilities were discovered in the Apache HTTP server. An attacker could send proxied requests to arbitrary servers, corrupt memory in some setups involving third-party modules, and cause the server to crash. CVE-2021-34798 Malformed requests may cause the server to dereference a NULL pointer.
CVE-2021-39275 ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may.
CVE-2021-40438 A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. For Debian 9 stretch, these problems have been fixed in version 2.4.25-3+deb9u11. We recommend that you upgrade your apache2 packages. For the detailed security status of apache2 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/apache2 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

Solution

Upgrade the apache2 packages.

For Debian 9 stretch, these problems have been fixed in version 2.4.25-3+deb9u11.

Plugin Details

Severity: Critical

ID: 153842

File Name: debian_DLA-2776.nasl

Version: 1.8

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 10/2/2021

Updated: 1/24/2025

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

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.2

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

CVSS Score Source: CVE-2021-39275

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:apache2-data, p-cpe:/a:debian:debian_linux:apache2-suexec-custom, p-cpe:/a:debian:debian_linux:apache2-utils, p-cpe:/a:debian:debian_linux:apache2-suexec-pristine, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:apache2-bin, p-cpe:/a:debian:debian_linux:apache2-dbg, p-cpe:/a:debian:debian_linux:apache2-doc, p-cpe:/a:debian:debian_linux:apache2-dev, p-cpe:/a:debian:debian_linux:apache2-ssl-dev, p-cpe:/a:debian:debian_linux:apache2

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: 10/2/2021

Vulnerability Publication Date: 9/16/2021

CISA Known Exploited Vulnerability Due Dates: 12/15/2021

Reference Information

CVE: CVE-2021-34798, CVE-2021-39275, CVE-2021-40438

IAVA: 2021-A-0440-S

Detections

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