Vulnerabilities > CVE-2016-6441 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Cisco IOS XE
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
A vulnerability in the Transaction Language 1 (TL1) code of Cisco ASR 900 Series routers could allow an unauthenticated, remote attacker to cause a reload of, or remotely execute code on, the affected system. This vulnerability affects Cisco ASR 900 Series Aggregation Services Routers (ASR902, ASR903, and ASR907) that are running the following releases of Cisco IOS XE Software: 3.17.0S 3.17.1S 3.17.2S 3.18.0S 3.18.1S. More Information: CSCuy15175. Known Affected Releases: 15.6(1)S 15.6(2)S. Known Fixed Releases: 15.6(1)S2.12 15.6(1.17)S0.41 15.6(1.17)SP 15.6(2)SP 16.4(0.183) 16.5(0.10).
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 7 |
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-SA-20161102-TL1.NASL |
| description | According to its self-reported version and model, the Cisco IOS XE software running on the remote ASR device is affected by a remote code execution vulnerability in the Transaction Language 1 (TL1) code due to an overflow condition caused by improper bounds checking on certain input when handling TL1 requests. An unauthenticated, remote attacker can exploit this, via a specially crafted request to the TL1 port, to cause a denial of service condition or the execution of arbitrary code. |
| last seen | 2020-05-09 |
| modified | 2016-11-10 |
| plugin id | 94680 |
| published | 2016-11-10 |
| reporter | This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. |
| source | https://www.tenable.com/plugins/nessus/94680 |
| title | Cisco IOS XE TL1 Request Handling RCE (cisco-sa-20161102-tl1) |
| code | |