Vulnerabilities > CVE-2013-6691 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Cisco Adaptive Security Appliance Software
Attack vector
NETWORK Attack complexity
LOW Privileges required
SINGLE Confidentiality impact
NONE Integrity impact
NONE Availability impact
COMPLETE Summary
The WebVPN CIFS implementation in Cisco Adaptive Security Appliance (ASA) Software 9.0(.4.1) and earlier allows remote CIFS servers to cause a denial of service (device reload) via a long share list, aka Bug ID CSCuj83344.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 1 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
| NASL family | CISCO |
| NASL id | CISCO-SN-CSCUJ83344-ASA.NASL |
| description | According to its banner, the version of the remote Cisco ASA device is affected by a denial of service vulnerability in the WebVPN CIFS (Common Internet File System) access function due to missing bounds checks on received responses when enumerating large amounts of shares on a CIFS server. A remote, authenticated attacker can exploit this issue by attempting to list the shares of a CIFS server with a large amount of shares. |
| last seen | 2019-10-28 |
| modified | 2014-08-28 |
| plugin id | 77411 |
| published | 2014-08-28 |
| reporter | This script is Copyright (C) 2014-2018 Tenable Network Security, Inc. |
| source | https://www.tenable.com/plugins/nessus/77411 |
| title | Cisco ASA WebVPN CIFS Share Enumeration DoS (CSCuj83344) |
| code | |