Netty up to 4.0.37/4.1.1 OpenSslEngine.java infinite loop

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-$5k	0.00

Summaryinfo

A vulnerability was found in Netty up to 4.0.37/4.1.1. It has been rated as problematic. This affects an unknown part of the file handler/ssl/OpenSslEngine.java. The manipulation leads to infinite loop. This vulnerability is uniquely identified as CVE-2016-4970. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Netty up to 4.0.37/4.1.1. It has been rated as problematic. This issue affects an unknown function of the file handler/ssl/OpenSslEngine.java. The manipulation with an unknown input leads to a infinite loop vulnerability. Using CWE to declare the problem leads to CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. Impacted is availability. The summary by CVE is:

handler/ssl/OpenSslEngine.java in Netty 4.0.x before 4.0.37.Final and 4.1.x before 4.1.1.Final allows remote attackers to cause a denial of service (infinite loop).

The bug was discovered 06/07/2016. The weakness was disclosed 04/13/2017 with IBM (Website). It is possible to read the advisory at netty.io. The identification of this vulnerability is CVE-2016-4970 since 05/24/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 310 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 4.0.37.Final or 4.1.1.Final eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 96540†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Netty

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 4.0.7
• 4.0.8
• 4.0.9
• 4.0.10
• 4.0.11
• 4.0.12
• 4.0.13
• 4.0.14
• 4.0.15
• 4.0.16
• 4.0.17
• 4.0.18
• 4.0.19
• 4.0.20
• 4.0.21
• 4.0.22
• 4.0.23
• 4.0.24
• 4.0.25
• 4.0.26
• 4.0.27
• 4.0.28
• 4.0.29
• 4.0.30
• 4.0.31
• 4.0.32
• 4.0.33
• 4.0.34
• 4.0.35
• 4.0.36
• 4.0.37
• 4.1.0
• 4.1.1

Website

• Product: https://github.com/netty/netty/

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

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Netty 4.0.37.Final/4.1.1.Final
Patch: github.com

Timelineinfo

05/24/2016 🔍
06/07/2016 +14 days 🔍
02/28/2017 +266 days 🔍
04/13/2017 +44 days 🔍
04/13/2017 +0 days 🔍
04/14/2017 +1 days 🔍
11/29/2022 +2055 days 🔍

Sourcesinfo

Product: github.com

Advisory: RHSA-2017:0179
Organization: IBM
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-4970 (🔍)
GCVE (CVE): GCVE-0-2016-4970
GCVE (VulDB): GCVE-100-99827
SecurityFocus: 96540 - IBM Development Package for Apache Spark CVE-2016-4970 Denial of Service Vulnerability

Entryinfo

Created: 04/14/2017 11:06
Updated: 11/29/2022 09:49
Changes: 04/14/2017 11:06 (62), 10/15/2019 10:03 (2), 11/29/2022 09:49 (5)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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