OpenSSL up to 1.0.2o/1.1.0h TLS Handshake key management

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in OpenSSL up to 1.0.2o/1.1.0h. The affected element is an unknown function of the component TLS Handshake. Such manipulation leads to key management. This vulnerability is listed as CVE-2018-0732. The attack may be performed from remote. There is no available exploit. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenSSL up to 1.0.2o/1.1.0h (Network Encryption Software). Affected by this issue is an unknown function of the component TLS Handshake. The manipulation with an unknown input leads to a key management vulnerability. Using CWE to declare the problem leads to CWE-320. Impacted is availability. CVE summarizes:

During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).

The bug was discovered 06/12/2018. The weakness was presented 06/12/2018 by Guido Vranken as confirmed git commit (GIT Repository). The advisory is available at git.openssl.org. This vulnerability is handled as CVE-2018-0732 since 11/30/2017. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 110878 (EulerOS 2.0 SP3 : openssl110f (EulerOS-SA-2018-1214)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Huawei Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157823 (Oracle Enterprise Linux Security Update for openssl (ELSA-2018-4249)).

Upgrading to version 1.0.2p-dev or 1.1.0i-dev eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.openssl.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (110878) and SecurityFocus (BID 104442†). See VDB-90449, VDB-91385, VDB-91680 and VDB-91681 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

Support

  • end of life (old version)

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Key management
CWE: CWE-320
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 110878
Nessus Name: EulerOS 2.0 SP3 : openssl110f (EulerOS-SA-2018-1214)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Upgrade: OpenSSL 1.0.2p-dev/1.1.0i-dev
Patch: 3984ef0b72831da8b3ece4745cac4f8575b19098

Timelineinfo

11/30/2017 🔍
06/12/2018 +193 days 🔍
06/12/2018 +0 days 🔍
06/12/2018 +0 days 🔍
06/12/2018 +0 days 🔍
06/12/2018 +0 days 🔍
06/27/2018 +15 days 🔍
07/03/2018 +6 days 🔍
03/22/2023 +1723 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: RHSA-2018:2552
Researcher: Guido Vranken
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0732 (🔍)
GCVE (CVE): GCVE-0-2018-0732
GCVE (VulDB): GCVE-100-119378

OVAL: 🔍

SecurityFocus: 104442 - OpenSSL CVE-2018-0732 Denial of Service Vulnerability
SecurityTracker: 1041090

See also: 🔍

Entryinfo

Created: 06/12/2018 21:42
Updated: 03/22/2023 14:56
Changes: 06/12/2018 21:42 (80), 06/27/2020 20:04 (4), 03/22/2023 14:56 (6)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!