Improper input validation in Cisco Anyconnect Secure Mobility Client
CVE-2017-6638
A vulnerability in how DLL files are loaded with Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to install and run an executable file with privileges equivalent to the Microsoft Windows SYSTEM account. The vulnerability is due to incomplete input validation of path and file names of a DLL file before it is loaded. An attacker could exploit this vulnerability by creating a malicious DLL file and installing it in a specific system directory. A successful exploit could allow the attacker to execute commands on the underlying Microsoft Windows host with privileges equivalent to the SYSTEM account. The attacker would need valid user credentials to exploit this vulnerability. This vulnerability affects all Cisco AnyConnect Secure Mobility Client for Windows software versions prior to 4.4.02034. Cisco Bug IDs: CSCvc97928.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (29.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Cisco Anyconnect Secure Mobility Client
- Cisco Anyconnect Local Privilege Escalation Vulnerability — versions Cisco AnyConnect Local Privilege Escalation Vulnerability
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/98938 (VDB Entry, Third Party Advisory, vdb-entry)
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607… (Vendor Advisory)
- www.securitytracker.com/id/1038627 (vdb-entry)
Frequently asked questions
- What is CVE-2017-6638?
- CVE-2017-6638 is a high-severity vulnerability in Cisco Anyconnect Secure Mobility Client, classified under CWE-264. CVSS score: 7.8/10. Published 2017-06-08.
- How severe is CVE-2017-6638?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2017-6638 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.