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CVE-2018-1000808

Published: 8 October 2018

Python Cryptographic Authority pyopenssl version Before 17.5.0 contains a CWE - 401 : Failure to Release Memory Before Removing Last Reference vulnerability in PKCS #12 Store that can result in Denial of service if memory runs low or is exhausted. This attack appear to be exploitable via Depends upon calling application, however it could be as simple as initiating a TLS connection. Anything that would cause the calling application to reload certificates from a PKCS #12 store.. This vulnerability appears to have been fixed in 17.5.0.

Notes

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

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
pyopenssl
Launchpad, Ubuntu, Debian
upstream
Released (17.5.0)
trusty Not vulnerable
(code not present)
xenial
Released (0.15.1-2ubuntu0.2)
bionic Not vulnerable
(17.5.0-1)
cosmic Not vulnerable
(17.5.0-1)
Patches:
upstream: https://github.com/pyca/pyopenssl/pull/723
upstream: https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H