CVE-2018-1000807

Publication date 8 October 2018

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.1 · High

Score breakdown

Description

Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.

Read the notes from the security team

Status

Package Ubuntu Release Status
pyopenssl 18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Fixed 0.15.1-2ubuntu0.2
14.04 LTS trusty
Not affected

Notes

mdeslaur

requires python-cryptography 2.1.4 which adds X509_up_ref, see https://github.com/pyca/cryptography/pull/4028

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
pyopenssl

Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.1 · High

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3813-1
    • pyOpenSSL vulnerabilities
    • 8 November 2018

Other references

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