A vulnerability was found in Synology Calendar up to 2.3.1 (Calendar Software) and classified as critical. This issue affects an unknown code block of the file drivers_syno_import_user.php of the component HTTP Header Handler. The manipulation of the argument X-Real-IP as part of a Command leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

OS command injection vulnerability in drivers_syno_import_user.php in Synology Calendar before 2.3.1-0617 allows remote attackers to execute arbitrary commands via the crafted 'X-Real-IP' header.

The weakness was presented 06/30/2019 (Website). The advisory is shared at synology.com. The identification of this vulnerability is CVE-2019-11829 since 05/08/2019. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

By approaching the search of inurl:drivers_syno_import_user.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.3.1-0617 eliminates this vulnerability.

See VDB-137089 for similar entry.

Productinfo

Type

• Calendar Software

Vendor

• Synology

Name

• Calendar

Version

• 2.3.0
• 2.3.1

License

• commercial

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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