#VU54302 Use of hard-coded credentials in Synology Calendar - CVE-2021-34812

Vulnerability identifier: #VU54302

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-34812

CWE-ID: CWE-798

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Synology Calendar
Client/Desktop applications / Other client software

Vendor: Synology Inc.

Description

The vulnerability allows a remote attacker to gain full access to vulnerable system.

The vulnerability exists due to presence of hard-coded credentials in php component. A remote unauthenticated attacker can access the affected system using the hard-coded credentials.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Synology Calendar: before 2.4.0-0761

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External links
https://www.synology.com/security/advisory/Synology_SA_21_12

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.