VDB-240764 · CVE-2023-43320 · GCVE-0-2023-43320

Proxmox Backup Server/Mail Gateway Two-factor Authentication improper authentication

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.
7.9	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Proxmox Backup Server and Mail Gateway. It has been declared as critical. The impacted element is an unknown function of the component Two-factor Authentication. Such manipulation leads to improper authentication. This vulnerability is traded as CVE-2023-43320. The attack may be launched remotely. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Proxmox Backup Server and Mail Gateway (Backup Software) (version now known) and classified as critical. Affected by this issue is some unknown processing of the component Two-factor Authentication. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue in Proxmox Server Solutions GmbH Proxmox VE v.5.4 thru v.8.0, Proxmox Backup Server v.1.1 thru v.3.0, and Proxmox Mail Gateway v.7.1 thru v.8.0 allows a remote authenticated attacker to escalate privileges via bypassing the two-factor authentication component.

The weakness was shared 09/28/2023 as 50b793db8d3421bbfe2bce060a486263f18a90cb. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-43320 since 09/18/2023. There are neither technical details nor an exploit publicly available.

Applying the patch 50b793db8d3421bbfe2bce060a486263f18a90cb is able to eliminate this problem. The bugfix is ready for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Backup Software

Vendor

Proxmox

Name

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
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: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 50b793db8d3421bbfe2bce060a486263f18a90cb

Timelineinfo

09/18/2023 🔍
09/28/2023 +10 days 🔍
09/28/2023 +0 days 🔍
10/21/2023 +23 days 🔍

Sourcesinfo

Advisory: 50b793db8d3421bbfe2bce060a486263f18a90cb
Status: Confirmed

CVE: CVE-2023-43320 (🔍)
GCVE (CVE): GCVE-0-2023-43320
GCVE (VulDB): GCVE-100-240764

Entryinfo

Created: 09/28/2023 07:27
Updated: 10/21/2023 12:02
Changes: 09/28/2023 07:27 (42), 10/21/2023 12:02 (11)
Complete: 🔍
Cache ID: 216::103