Vulnerability identifier: #VU12391

Vulnerability risk: Low

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0253

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Secure Access Control Server
Server applications / Directory software, identity management

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote unauthenticated attacker to execute arbitrary commands on the target system.

The weakness exists in the ACS Report component due to insufficient validation of the Action Message Format (AMF) protocol. A remote attacker can send a specially crafted AMF message that contains malicious code, inject and execute arbitrary commands with root privileges.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco Secure Access Control Server: 5.8.0.8

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-acs1

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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.