CVE-2017-6736
HIGH KEVCisco IOS and IOS XE - Authenticated Remote Code Execution via SNMP Buffer Overflow
Title source: llmExploitation Summary
CVE-2017-6736 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added March 3, 2022. EIP tracks 4 public exploits from researchers including Artem Kondratenko, plyrthn, msztankowski.
AI-analyzed exploit summary This exploit leverages a buffer overflow in Cisco IOS SNMP service (CVE-2017-6736) to achieve remote code execution by writing shellcode to a specific memory address and redirecting execution flow. It targets Cisco 2800 series routers with specific firmware versions.
Description
The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities. The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload. Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable. There are workarounds that address these vulnerabilities.
Exploits (4)
This exploit leverages a buffer overflow in Cisco IOS SNMP service (CVE-2017-6736) to achieve remote code execution by writing shellcode to a specific memory address and redirecting execution flow. It targets Cisco 2800 series routers with specific firmware versions.
This repository provides a proof-of-concept exploit chain combining CVE-2017-6736 (Cisco SNMP RCE) with Spectre vulnerabilities (CVE-2017-5753 and CVE-2017-5715). It leverages the Cisco exploit to redirect traffic through a Spectre login page.
This repository contains a PoC exploit for CVE-2017-6736, a buffer overflow vulnerability in Cisco IOS SNMP. The exploit uses a combination of SNMP overflow and telnet commands to achieve remote code execution and modify the router's configuration.
This repository contains a PoC exploit for CVE-2017-6736, a buffer overflow vulnerability in Cisco IOS SNMP. The exploit uses a crafted SNMP packet to achieve remote code execution and then configures the router via Telnet to modify its routing table.
References (7)
Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H