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Scientific Linux Security Update : httpd on SL6.x i386/x86_64 (20170711)
high Nessus Plugin ID 101387
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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
Plugin Details
Severity: High
ID: 101387
File Name: sl_20170711_httpd_on_SL6_x.nasl
Version: 3.6
Type: local
Agent: unix
Published: 7/12/2017
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
CVSS v3
Risk Factor: High
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: 7/11/2017
Vulnerability Publication Date: 7/27/2017
Reference Information
CVE: CVE-2016-8743