Kaseya Unitrends Backup Appliance prior 10.5.5 Apache User access control

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 (≈)
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CTI Interest Score
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6.9$0-$5k0.00

A vulnerability was found in Kaseya Unitrends Backup Appliance (Backup Software). It has been declared as critical. This vulnerability affects an unknown part of the component Apache User Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-284. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A world writable file allowed local users to execute arbitrary code as the user apache, leading to privilege escalation.

The weakness was published 12/06/2021. The advisory is shared for download at helpdesk.kaseya.com. This vulnerability was named CVE-2021-43034 since 10/26/2021. The exploitation appears to be easy. The attack can be initiated remotely. A single authentication is necessary for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 10.5.5 eliminates this vulnerability.

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CPE 2.3infoedit

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CVSSv3infoedit

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2infoedit

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Unitrends Backup Appliance 10.5.5

Timelineinfoedit

10/26/2021 CVE assigned
12/06/2021 +41 days Advisory disclosed
12/06/2021 +0 days VulDB entry created
12/09/2021 +3 days VulDB last update

Sourcesinfoedit

Advisory: helpdesk.kaseya.com
Status: Confirmed

CVE: CVE-2021-43034 (🔒)

Entryinfoedit

Created: 12/06/2021 07:55 AM
Updated: 12/09/2021 09:39 AM
Changes: (18) vulnerability_cvss2_nvd_basescore vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss3_nvd_basescore vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a
Complete: 🔍

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