CentOS 6 : httpd (CESA-2017:1721)

high Nessus Plugin ID 101488

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Synopsis

The remote CentOS host is missing one or more security updates.

Description

An update for httpd is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es) :

* It was discovered that the HTTP parser in httpd incorrectly allowed certain characters not permitted by the HTTP protocol specification to appear unencoded in HTTP request headers. If httpd was used in conjunction with a proxy or backend server that interpreted those characters differently, a remote attacker could possibly use this flaw to inject data into HTTP responses, resulting in proxy cache poisoning. (CVE-2016-8743)

Note: The fix for the CVE-2016-8743 issue causes httpd to return '400 Bad Request' error to HTTP clients which do not strictly follow HTTP protocol specification. A newly introduced configuration directive 'HttpProtocolOptions Unsafe' can be used to re-enable the old less strict parsing. However, such setting also re-introduces the CVE-2016-8743 issue.

Note: Administrators of Red Hat Satellite 5 and Red Hat Satellite Proxy 5 systems should consult Red Hat Knowledgebase article 3013361 linked to in the Reference section before installing this update.

Bug Fix(es) :

* Previously, httpd was unable to correctly check a boundary of an array, and in rare cases it attempted to access an element of an array that was out of bounds. Consequently, httpd terminated unexpectedly with a segmentation fault at proxy_util.c. With this update, bounds checking has been fixed, and httpd no longer crashes. (BZ#1463354)

Solution

Update the affected httpd packages.

Plugin Details

Severity: High

ID: 101488

File Name: centos_RHSA-2017-1721.nasl

Version: 3.9

Type: local

Agent: unix

Family: CentOS Local Security Checks

Published: 7/13/2017

Updated: 1/4/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2016-8743

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:centos:centos:httpd, p-cpe:/a:centos:centos:httpd-devel, p-cpe:/a:centos:centos:httpd-manual, p-cpe:/a:centos:centos:httpd-tools, p-cpe:/a:centos:centos:mod_ssl, cpe:/o:centos:centos:6

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 7/12/2017

Vulnerability Publication Date: 7/27/2017

Reference Information

CVE: CVE-2016-8743

RHSA: 2017:1721

Detections

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