CVE-2021-27646

Synology DiskStation Manager iscsi_snapshot_comm_core Use-After-Free Remote Code Execution Vulnerability

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Use After Free vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via crafted web requests.

Una vulnerabilidad de Uso de la Memoria Previamente Liberada en iscsi_snapshot_comm_core en Synology DiskStation Manager (DSM) versiones anteriores a 6.2.3-25426-3, permite a atacantes remotos ejecutar código arbitrario por medio de peticiones web diseñadas

This vulnerability allows local attackers to execute arbitrary code on affected installations of Synology DS418play. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the iscsi_snapshot_comm_core service. The issue results from the lack of proper locking when performing operations on an object, which can cause a pointer to be reused after it has been freed. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute code in the context of the current process.

*Credits: Anonymous

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-02-24 CVE Reserved
2021-03-12 CVE Published
2024-05-13 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-416: Use After Free

CAPEC

References (3)

URL	Tag	Source
https://www.zerodayinitiative.com/advisories/ZDI-21-339	Not Applicable
https://www.zerodayinitiative.com/advisories/ZDI-21-340	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.synology.com/security/advisory/Synology_SA_20_26	2021-03-26

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Synology Search vendor "Synology"		Diskstation Manager Search vendor "Synology" for product "Diskstation Manager"				< 6.2.3-25426-3 Search vendor "Synology" for product "Diskstation Manager" and version " < 6.2.3-25426-3"		-		Affected