pyOpenSSL up to 17.4.x X.509 Object use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in pyOpenSSL up to 17.4.x. Affected is an unknown function of the component X.509 Object Handler. Such manipulation leads to use after free. This vulnerability is documented as CVE-2018-1000807. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in pyOpenSSL up to 17.4.x (Network Encryption Software). It has been rated as critical. Affected by this issue is some unknown functionality of the component X.509 Object Handler. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 11/30/2017. The weakness was released 10/08/2018 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is handled as CVE-2018-1000807 since 10/08/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 312 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118855 (Ubuntu 16.04 LTS : pyopenssl vulnerabilities (USN-3813-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171759 (SUSE Enterprise Linux Security Update for python-cryptography, python-pyOpenSSL (SUSE-SU-2018:4063-1)).

Upgrading to version 17.5.0 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118855). Entry connected to this vulnerability is available at VDB-125037. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 118855
Nessus Name: Ubuntu 16.04 LTS : pyopenssl vulnerabilities (USN-3813-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: pyOpenSSL 17.5.0
Patch: github.com

Timelineinfo

11/30/2017 🔍
10/08/2018 +311 days 🔍
10/08/2018 +0 days 🔍
10/08/2018 +0 days 🔍
10/09/2018 +1 days 🔍
11/08/2018 +30 days 🔍
11/09/2018 +1 days 🔍
05/23/2023 +1656 days 🔍

Sourcesinfo

Advisory: RHSA-2019:0085
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-1000807 (🔍)
GCVE (CVE): GCVE-0-2018-1000807
GCVE (VulDB): GCVE-100-125036
See also: 🔍

Entryinfo

Created: 10/09/2018 08:23
Updated: 05/23/2023 09:00
Changes: 10/09/2018 08:23 (74), 03/31/2020 15:02 (3), 05/23/2023 09:00 (5)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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