VDB-157261 · CVE-2019-20892 · GCVE-0-2019-20892

net-snmp up to 5.8.0 SNMPv3 GetBulk Request snmplib/snmpusm.c usm_free_usmStateReference double free

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.
7.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in net-snmp up to 5.8.0 and classified as critical. Affected by this issue is the function usm_free_usmStateReference in the library snmplib/snmpusm.c of the component SNMPv3 GetBulk Request Handler. The manipulation leads to double free. This vulnerability is handled as CVE-2019-20892. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Detailsinfo

A vulnerability has been found in net-snmp up to 5.8.0 (Network Management Software) and classified as critical. Affected by this vulnerability is the function usm_free_usmStateReference in the library snmplib/snmpusm.c of the component SNMPv3 GetBulk Request Handler. The manipulation with an unknown input leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request. NOTE: this affects net-snmp packages shipped to end users by multiple Linux distributions, but might not affect an upstream release.

The weakness was released 06/25/2020 (Website). The advisory is shared at bugs.launchpad.net. This vulnerability is known as CVE-2019-20892 since 06/25/2020. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 5.8.1.pre1 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Network Management Software

Name

net-snmp

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

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: net-snmp 5.8.1.pre1

Timelineinfo

06/25/2020 🔍
06/25/2020 +0 days 🔍
06/26/2020 +1 days 🔍
06/26/2020 +0 days 🔍

Sourcesinfo

Advisory: bugs.launchpad.net
Status: Not defined

CVE: CVE-2019-20892 (🔍)
GCVE (CVE): GCVE-0-2019-20892
GCVE (VulDB): GCVE-100-157261

Entryinfo

Created: 06/26/2020 09:00
Updated: 06/26/2020 09:05
Changes: 06/26/2020 09:00 (40), 06/26/2020 09:05 (18)
Complete: 🔍
Cache ID: 216:E7F:103