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

critical Nessus Plugin ID 128182


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: 1.5

Type: local

Agent: unix

Published: 8/27/2019

Updated: 12/6/2022

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

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2019-10082


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: CVSS:3.0/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