Remote code execution in DrayTek VigorACS
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2017-5641 |
| CWE-ID | CWE-502 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
VigorACS 2 Server applications / Remote management servers, RDP, SSH |
| Vendor | DrayTek Corp. |
Security Bulletin
This security bulletin contains information about 1 vulnerabilities.
The vulnerability is present in an exposed "/ACSServer/messabroker/amf" endpoint.
1) Deserializatoin of untrusted data
EUVDB-ID: #VU6303
Risk: High
CVSSv3.1: 9.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]
CVE-ID: CVE-2017-5641
CWE-ID:
CWE-502 - Deserialization of Untrusted Data
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the use of BlazeDS to process AMF3 messages within Customer Experience Improvement Program (CEIP) functionality. A remote attacker can execute arbitrary code on the target system when deserializing an untrusted Java object.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
MitigationUpdate to version 2.2.2.
Vulnerable software versionsVigorACS 2: 2.1.0 - 2.2.1
External linkshttp://blogs.securiteam.com/index.php/archives/3681
http://github.com/pedrib/PoC/blob/master/exploits/acsPwn/acsPwn.rb
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.
