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CVE-2018-10903

7.5 · HIGH

A flaw was found in python-cryptography versions between >=1.9.0 and <2.3.

Published Jul 30, 2018CWE-20EPSS 3.20%

Overview

CVE-2018-10903 is a high-severity vulnerability. It was published on July 30, 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

A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.

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

Refaccess.redhat.com/errata/RHSA-2018:3600Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903GitHubgithub.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19efRefusn.ubuntu.com/3720-1/Refaccess.redhat.com/errata/RHSA-2018:3600Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903GitHubgithub.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19efRefusn.ubuntu.com/3720-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-10903?

CVE-2018-10903 is a high-severity vulnerability. It was published on July 30, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2018-10903?

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-2018-10903?

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-2018-10903?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-10903 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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