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Vulnerability Details : CVE-2017-9798

Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.
Publish Date : 2017-09-18 Last Update Date : 2018-04-19
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 416

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2017:2882: httpd security update (Moderate) oval:com.redhat.rhsa:def:20172882 unix
RHSA-2017:2972: httpd security update (Moderate) oval:com.redhat.rhsa:def:20172972 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2017-9798

# Product Type Vendor Product Version Update Edition Language
1 Application Apache Http Server 2.2.34 Version Details Vulnerabilities
2 Application Apache Http Server 2.4.0 Version Details Vulnerabilities
3 Application Apache Http Server 2.4.1 Version Details Vulnerabilities
4 Application Apache Http Server 2.4.2 Version Details Vulnerabilities
5 Application Apache Http Server 2.4.3 Version Details Vulnerabilities
6 Application Apache Http Server 2.4.4 Version Details Vulnerabilities
7 Application Apache Http Server 2.4.6 Version Details Vulnerabilities
8 Application Apache Http Server 2.4.7 Version Details Vulnerabilities
9 Application Apache Http Server 2.4.9 Version Details Vulnerabilities
10 Application Apache Http Server 2.4.10 Version Details Vulnerabilities
11 Application Apache Http Server 2.4.12 Version Details Vulnerabilities
12 Application Apache Http Server 2.4.16 Version Details Vulnerabilities
13 Application Apache Http Server 2.4.17 Version Details Vulnerabilities
14 Application Apache Http Server 2.4.18 Version Details Vulnerabilities
15 Application Apache Http Server 2.4.20 Version Details Vulnerabilities
16 Application Apache Http Server 2.4.23 Version Details Vulnerabilities
17 Application Apache Http Server 2.4.25 Version Details Vulnerabilities
18 Application Apache Http Server 2.4.26 Version Details Vulnerabilities
19 Application Apache Http Server 2.4.27 Version Details Vulnerabilities
20 OS Debian Debian Linux 7.0 Version Details Vulnerabilities
21 OS Debian Debian Linux 8.0 Version Details Vulnerabilities
22 OS Debian Debian Linux 9.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Apache Http Server 19
Debian Debian Linux 3

- References For CVE-2017-9798

https://security.gentoo.org/glsa/201710-32
GENTOO GLSA-201710-32
https://support.apple.com/HT208331 CONFIRM
https://access.redhat.com/errata/RHSA-2017:2972
REDHAT RHSA-2017:2972
https://access.redhat.com/errata/RHSA-2017:3018
REDHAT RHSA-2017:3018
https://access.redhat.com/errata/RHSA-2017:3113
REDHAT RHSA-2017:3113
https://access.redhat.com/errata/RHSA-2017:3114
REDHAT RHSA-2017:3114
https://access.redhat.com/errata/RHSA-2017:3193
REDHAT RHSA-2017:3193
https://www.exploit-db.com/exploits/42745/
EXPLOIT-DB 42745
https://security-tracker.debian.org/tracker/CVE-2017-9798
https://blog.fuzzing-project.org/uploads/apache-2.2-optionsbleed-backport.patch
https://github.com/hannob/optionsbleed
https://access.redhat.com/errata/RHSA-2017:3194
REDHAT RHSA-2017:3194
https://github.com/apache/httpd/commit/29afdd2550b3d30a8defece2b95ae81edcf66ac9
https://access.redhat.com/errata/RHSA-2017:3477
REDHAT RHSA-2017:3477
https://blog.fuzzing-project.org/60-Optionsbleed-HTTP-OPTIONS-method-can-leak-Apaches-server-memory.html
https://access.redhat.com/errata/RHSA-2017:3475
REDHAT RHSA-2017:3475
https://access.redhat.com/errata/RHSA-2017:3476
REDHAT RHSA-2017:3476
https://access.redhat.com/errata/RHSA-2017:3195
REDHAT RHSA-2017:3195
https://access.redhat.com/errata/RHSA-2017:3240
REDHAT RHSA-2017:3240
https://access.redhat.com/errata/RHSA-2017:3239
REDHAT RHSA-2017:3239
https://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/server/core.c?r1=1805223&r2=1807754&pathrev=1807754&view=patch
http://www.securitytracker.com/id/1039387
SECTRACK 1039387
http://openwall.com/lists/oss-security/2017/09/18/2
http://www.debian.org/security/2017/dsa-3980
DEBIAN DSA-3980
http://www.securityfocus.com/bid/100872
BID 100872 Apache HTTP Server CVE-2017-9798 Information Disclosure Vulnerability Release Date:2018-04-26
https://access.redhat.com/errata/RHSA-2017:2882
REDHAT RHSA-2017:2882
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html CONFIRM
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html CONFIRM

- Metasploit Modules Related To CVE-2017-9798

Apache Optionsbleed Scanner
This module scans for the Apache optionsbleed vulnerability where the Allow response header returned from an OPTIONS request may bleed memory if the server has a .htaccess file with an invalid Limit method defined.
Module type : auxiliary Rank : normal


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