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

medium Nessus Plugin ID 128182
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VPR Score: 6.7


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: Medium

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

Risk Factor: Medium

VPR Score: 6.7

CVSS Score Source: CVE-2019-10082

CVSS v2.0

Base Score: 6.4

Temporal Score: 5

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

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

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: cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*, p-cpe:2.3: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: 8/26/2019

Vulnerability Publication Date: 8/13/2019

Reference Information

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

DSA: 4509