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CVE-2018-20102

7.5 · HIGH

An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14.

Published Dec 12, 2018CWE-125EPSS 4.15%

Overview

CVE-2018-20102 is a high-severity vulnerability. It was published on December 12, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 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

An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.

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

Refgit.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=efbbdf72992cd20458259962346044cafd9331c0Refwww.securityfocus.com/bid/106223Refaccess.redhat.com/errata/RHBA-2019:0326Refaccess.redhat.com/errata/RHBA-2019:0327Refaccess.redhat.com/errata/RHSA-2019:1436Reflists.debian.org/debian-lts-announce/2022/05/msg00045.htmlRefusn.ubuntu.com/3858-1/Refgit.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=efbbdf72992cd20458259962346044cafd9331c0Refwww.securityfocus.com/bid/106223Refaccess.redhat.com/errata/RHBA-2019:0326

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20102?

CVE-2018-20102 is a high-severity vulnerability. It was published on December 12, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2018-20102?

This vulnerability has a CVSS 3.0 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-2018-20102?

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-2018-20102?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20102 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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