Debian DSA-4757-1 : apache2 - security update

critical Nessus Plugin ID 140104
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


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


Several vulnerabilities have been found in the Apache HTTPD server.

- CVE-2020-1927 Fabrice Perez reported that certain mod_rewrite configurations are prone to an open redirect.

- CVE-2020-1934 Chamal De Silva discovered that the mod_proxy_ftp module uses uninitialized memory when proxying to a malicious FTP backend.

- CVE-2020-9490 Felix Wilhelm discovered that a specially crafted value for the 'Cache-Digest' header in a HTTP/2 request could cause a crash when the server actually tries to HTTP/2 PUSH a resource afterwards.

- CVE-2020-11984 Felix Wilhelm reported a buffer overflow flaw in the mod_proxy_uwsgi module which could result in information disclosure or potentially remote code execution.

- CVE-2020-11993 Felix Wilhelm reported that when trace/debug was enabled for the HTTP/2 module certain traffic edge patterns can cause logging statements on the wrong connection, causing concurrent use of memory pools.


Upgrade the apache2 packages.

For the stable distribution (buster), these problems have been fixed in version 2.4.38-3+deb10u4.

See Also

Plugin Details

Severity: Critical

ID: 140104

File Name: debian_DSA-4757.nasl

Version: 1.6

Type: local

Agent: unix

Published: 9/1/2020

Updated: 6/7/2021

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: High

Score: 8.4


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

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


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:apache2, cpe:/o:debian:debian_linux:10.0

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: 8/31/2020

Vulnerability Publication Date: 4/1/2020

Reference Information

CVE: CVE-2020-11984, CVE-2020-11993, CVE-2020-1927, CVE-2020-1934, CVE-2020-9490

DSA: 4757

IAVA: 2020-A-0376-S