SB2020051134 - Denial of service in Synology Router Manager (SRM)

Description

This security bulletin contains information about 1 vulnerability.

1) CRLF injection (CVE-ID: CVE-2019-11823)

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear

The vulnerability allows a remote attacker to perform CRLF injection attacks.

The vulnerability exists due to insufficient filtration of user-supplied data in the DHCP monitor's hostname parsing functionality. A remote attacker on the local network can send a specially crafted network request, trigger an out-of-bounds read and cause a denial of service (DoS) condition on the target system.

Note: This vulnerability affects the following versions:

• Synology SRM 1.2.3 MR2200ac 8017
• Synology SRM 1.2.3 RT2600ac 8017

Remediation

Install update from vendor's website.

References

• https://www.synology.com/security/advisory/Synology_SA_20_11
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1051