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CVE-2017-7805

7.5 · HIGH

During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer.

Published Jun 11, 2018CWE-416EPSS 3.11%

Overview

CVE-2017-7805 is a high-severity vulnerability. It was published on June 11, 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

During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

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

Refwww.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlRefwww.securityfocus.com/bid/101059Refwww.securitytracker.com/id/1039465Refaccess.redhat.com/errata/RHSA-2017:2832Refbugzilla.mozilla.org/show_bug.cgi?id=1377618Reflists.debian.org/debian-lts-announce/2017/11/msg00000.htmlRefsecurity.gentoo.org/glsa/201803-14Refwww.debian.org/security/2017/dsa-3987Refwww.debian.org/security/2017/dsa-3998Refwww.debian.org/security/2017/dsa-4014

How CyberStrike helps

Frequently asked questions

What is CVE-2017-7805?

CVE-2017-7805 is a high-severity vulnerability. It was published on June 11, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2017-7805?

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-2017-7805?

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-2017-7805?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-7805 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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