CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
8.7 | $0-$5k | 0.00 |
A vulnerability has been found in Cisco IOS and IOS XE (Router Operating System) (version now known) and classified as critical. Affected by this vulnerability is some unknown processing of the component SNMPv1/SNMPv2c/SNMPv3. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.
The bug was discovered 06/29/2017. The weakness was published 06/29/2017 with Cisco as cisco-sa-20170629-snmp as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is known as CVE-2017-6736 since 03/09/2017. The attack can be launched remotely. Required for exploitation is a single authentication. Technical details are unknown but a public exploit is available. The advisory points out:
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.
A public exploit has been developed by Artem Kondratenko in Python and been published 7 months after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as highly functional. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 101268 (Cisco IOS SNMP Packet Handling Remote Buffer Overflow Multiple RCE (cisco-sa-20170629-snmp)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316125 (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilities (cisco-sa-20170629-snmp)). The code used by the exploit is:
s0 = bin2oid(sh_dword) # shellcode dword s1 = bin2oid('\x00\x00\x00\x00') s2 = bin2oid('\xBF\xC5\xB7\xDC') s3 = bin2oid('\x00\x00\x00\x00') s4 = bin2oid('\x00\x00\x00\x00') s5 = bin2oid('\x00\x00\x00\x00') s6 = bin2oid('\x00\x00\x00\x00') ra = bin2oid('\xbf\xc2\x2f\x60') # return control flow jumping over 1 stack frame s0_2 = bin2oid(shift(shellcode_start, k * 4)) ra_2 = bin2oid('\xbf\xc7\x08\x60') s0_3 = bin2oid('\x00\x00\x00\x00') ra_3 = bin2oid('\xBF\xC3\x86\xA0') payload = alps_oid.format(s0, s1, s2, s3, s4, s5, s6, ra, s0_2, ra_2, s0_3, ra_3)The advisory illustrates:
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 CISA Known Exploited Vulnerabilities Catalog lists this issue since 03/03/2022 with a due date of 03/24/2022:
Apply updates per vendor instructions.
It is possible to mitigate the problem by applying the configuration setting . A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:
Administrators are advised to allow only trusted users to have SNMP access on an affected system.
The vulnerability is also documented in the databases at Tenable (101268) and Exploit-DB (43450). Similar entries are available at 102956, 102957, 102958 and 102959.
Product
Type
Vendor
Name
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 8.8VulDB Meta Temp Score: 8.7
VulDB Base Score: 8.8
VulDB Temp Score: 8.6
VulDB Vector: 🔍
VulDB Reliability: 🔍
Vendor Base Score (Cisco): 8.8
Vendor Vector (Cisco): 🔍
NVD Base Score: 8.8
NVD Vector: 🔍
CVSSv2
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
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VulDB Base Score: 🔍
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Exploiting
Class: Memory corruptionCWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Highly functional
Author: Artem Kondratenko
Programming Language: 🔍
Download: 🔍
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0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 101268
Nessus Name: Cisco IOS SNMP Packet Handling Remote Buffer Overflow Multiple RCE (cisco-sa-20170629-snmp)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 103403
OpenVAS Name: SNMP Remote Code Execution Vulnerabilities in Cisco IOS Software
OpenVAS File: 🔍
OpenVAS Family: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Exploit-DB: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
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Countermeasures
Recommended: ConfigStatus: 🔍
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0-Day Time: 🔍
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Timeline
03/09/2017 🔍06/29/2017 🔍
06/29/2017 🔍
06/29/2017 🔍
06/29/2017 🔍
06/29/2017 🔍
06/30/2017 🔍
07/07/2017 🔍
07/17/2017 🔍
01/05/2018 🔍
01/05/2018 🔍
04/23/2024 🔍
Sources
Vendor: cisco.comAdvisory: cisco-sa-20170629-snmp
Researcher: Cisco.
Organization: Cisco
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2017-6736 (🔍)
OVAL: 🔍
SecurityTracker: 1038808
SecurityFocus: 99345 - Cisco IOS and IOS XE Software Multiple Remote Code Execution Vulnerabilities
scip Labs: https://www.scip.ch/en/?labs.20150108
See also: 🔍
Entry
Created: 06/30/2017 12:57Updated: 04/23/2024 13:50
Changes: 06/30/2017 12:57 (107), 12/20/2019 09:47 (3), 12/30/2020 10:48 (2), 12/30/2020 10:53 (1), 04/23/2024 13:50 (28)
Complete: 🔍
Cache ID: 3:E47:103
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