SB2017020901 - Buffer overflow in Clientless SSL VPN feature in Cisco ASA

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Main Vulnerability Database SB2017020901

SB2017020901 - Buffer overflow in Clientless SSL VPN feature in Cisco ASA

Published: February 9, 2017 Updated: February 17, 2017

Security Bulletin ID SB2017020901
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2017-3807)

CWE-ID: CWE-119 - Memory corruption

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


The vulnerability allows an authenticated remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when parsing HTTP requests within Common Internet Filesystem (CIFS) code in the Clientless SSL VPN functionality of Cisco ASA Software. A remote authenticated attacker can send a specially crafted HTTP request to "https://<asa_ip_address>/+webvpn+/CIFS_R/" URL, trigger heap-based buffer overflow and cause denial of service or execute arbitrary code on vulnerable device.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable device.


Remediation

Install update from vendor's website.

References