Debian DSA-4509-1 : apache2 - security update (Internal Data Buffering)

critical Nessus Plugin ID 128182
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-2019-9517 Jonathan Looney reported that a malicious client could perform a denial of service attack (exhausting h2 workers) by flooding a connection with requests and basically never reading responses on the TCP connection.

- CVE-2019-10081 Craig Young reported that HTTP/2 PUSHes could lead to an overwrite of memory in the pushing request's pool, leading to crashes.

- CVE-2019-10082 Craig Young reported that the HTTP/2 session handling could be made to read memory after being freed, during connection shutdown.

- CVE-2019-10092 Matei 'Mal' Badanoiu reported a limited cross-site scripting vulnerability in the mod_proxy error page.

- CVE-2019-10097 Daniel McCarney reported that when mod_remoteip was configured to use a trusted intermediary proxy server using the 'PROXY' protocol, a specially crafted PROXY header could trigger a stack buffer overflow or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by untrusted HTTP clients. The issue does not affect the stretch release.

- CVE-2019-10098 Yukitsugu Sasaki reported a potential open redirect vulnerability in the mod_rewrite module.


Upgrade the apache2 packages.

For the oldstable distribution (stretch), these problems have been fixed in version 2.4.25-3+deb9u8.

For the stable distribution (buster), these problems have been fixed in version 2.4.38-3+deb10u1.

See Also

Plugin Details

Severity: Critical

ID: 128182

File Name: debian_DSA-4509.nasl

Version: 1.3

Type: local

Agent: unix

Published: 8/27/2019

Updated: 12/31/2019

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2019-10082


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

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


Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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, cpe:/o:debian:debian_linux:9.0

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: 8/26/2019

Vulnerability Publication Date: 8/13/2019

Reference Information

CVE: CVE-2019-10081, CVE-2019-10082, CVE-2019-10092, CVE-2019-10097, CVE-2019-10098, CVE-2019-9517

DSA: 4509