XXE attack in Cisco AnyConnect Secure Mobility Client

1) XXE attack

EUVDB-ID: #VU10120

Risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0100

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

Description

The vulnerability allows a local unauthenticated attacker to perform XXE attack on the target system.

The weakness exists in the Profile Editor of the Cisco AnyConnect Secure Mobility Client due to improper handling of XML External Entity (XXE) entries when parsing an XML file. A local attacker can inject a specially crafted XML file with malicious entries to gain read and write access to the files.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco AnyConnect Secure Mobility Client: 4.4.4030

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-acpe

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.