Scientific Linux Security Update : httpd on SL6.x i386/x86_64 (20170711)

Medium Nessus Plugin ID 101387

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 3.6

Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

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.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?120580a4

Plugin Details

Severity: Medium

ID: 101387

File Name: sl_20170711_httpd_on_SL6_x.nasl

Version: 3.5

Type: local

Agent: unix

Published: 2017/07/12

Updated: 2020/02/25

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS v2.0

Base Score: 5

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

CVSS v3.0

Base Score: 7.5

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

Vulnerability Information

CPE: p-cpe:/a:fermilab:scientific_linux:httpd, p-cpe:/a:fermilab:scientific_linux:httpd-debuginfo, p-cpe:/a:fermilab:scientific_linux:httpd-devel, p-cpe:/a:fermilab:scientific_linux:httpd-manual, p-cpe:/a:fermilab:scientific_linux:httpd-tools, p-cpe:/a:fermilab:scientific_linux:mod_ssl, x-cpe:/o:fermilab:scientific_linux

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

Patch Publication Date: 2017/07/11

Vulnerability Publication Date: 2017/07/27

Reference Information

CVE: CVE-2016-8743