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CVE-2017-9798

7.5 · HIGH

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 Option…

Published Sep 18, 2017CWE-416EPSS 95.00%

Overview

CVE-2017-9798 is a high-severity vulnerability. It was published on September 18, 2017 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refopenwall.com/lists/oss-security/2017/09/18/2Refwww.debian.org/security/2017/dsa-3980Refwww.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlRefwww.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlRefwww.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlRefwww.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlRefwww.securityfocus.com/bid/100872Refwww.securityfocus.com/bid/105598Refwww.securitytracker.com/id/1039387Refaccess.redhat.com/errata/RHSA-2017:2882

How CyberStrike helps

Frequently asked questions

What is CVE-2017-9798?

CVE-2017-9798 is a high-severity vulnerability. It was published on September 18, 2017 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2017-9798?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-9798?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-9798?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-9798 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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