SRC-2018-0005 : Synology Photo Station LogList Stored Cross Site Scripting Authentication Bypass Vulnerability

CVE ID:

N/A

CVSS Score:

5.0, (AV:N/AC:L/Au:N/C:N/I:P/A:N)

Affected Vendors:

Synology

Affected Products:

Disk Station Manager (DSN)

Vulnerability Details:

This vulnerability allows remote attackers to bypass authentication on vulnerable installations of Synology Photo Station. User interaction is not required to exploit this vulnerability.

The specific flaw exists when parsing html characters in the LogList function. The issue results from the lack of proper validation and escaping of user-supplied data, which can result in a arbitrary script injection. An attacker can leverage this vulnerability in conjunction with other vulnerabilities to execute code in the context of the PhotoStation user.

Vendor Response:

Synology has issued an update to correct these vulnerabilities. More details can be found at:
https://www.synology.com/en-global/support/security/Synology_SA_18_02

Disclosure Timeline:

• 2017-12-19 – Verified and sent to Delta Industrial Automation
• 2018-01-14 – Coordinated public release of advisory

Proof of Concept:

/pocs/src-2018-{0005,0006}.py.txt

Credit:

This vulnerability was discovered by Steven Seeley (mr_me) of Offensive Security