Parallels Desktop 16.5.0 Symbolic Links toctou

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Parallels Desktop 16.5.0. This affects an unknown function of the component Symbolic Links Handler. Executing a manipulation can lead to toctou. This vulnerability is tracked as CVE-2021-34986. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability was found in Parallels Desktop 16.5.0. It has been declared as critical. This vulnerability affects an unknown code block of the component Symbolic Links Handler. The manipulation with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.0 (49183). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the Parallels Service. By creating a symbolic link, an attacker can abuse the service to execute a file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13932.

The weakness was disclosed 07/16/2022. The advisory is shared for download at zerodayinitiative.com. This vulnerability was named CVE-2021-34986 since 06/17/2021. There are neither technical details nor an exploit publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.8
CNA Vector (Zero Day Initiative): 🔍

CVSSv2info

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

Exploitinginfo

Class: Toctou
CWE: CWE-367 / CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/17/2021 🔍
07/16/2022 +394 days 🔍
07/16/2022 +0 days 🔍
08/01/2022 +16 days 🔍

Sourcesinfo

Vendor: parallels.com

Advisory: zerodayinitiative.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-34986 (🔍)
GCVE (CVE): GCVE-0-2021-34986
GCVE (VulDB): GCVE-100-203992

Entryinfo

Created: 07/16/2022 09:53
Updated: 08/01/2022 09:24
Changes: 07/16/2022 09:53 (49), 08/01/2022 09:24 (11)
Complete: 🔍
Cache ID: 216::103

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