Asmb8-ikvm Firmware: Improper Neutralization of Special Elements used in a Command
CVE-2023-26602 is a critical-severity improper neutralization of special elements used in a command vulnerability in Asmb8-ikvm Firmware from ASUS, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Asmb8-ikvm Firmware versions: 1.14.51 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 17.4% chance of exploitation within 30 days, which is in the top 2.83% of all scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of Asmb8-ikvm Firmware you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| ASUS | Asmb8-ikvm Firmware | 1.14.51 and earlier | Not stated |
Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
Official description
ASUS ASMB8 iKVM firmware through 1.14.51 allows remote attackers to execute arbitrary code by using SNMP to create extensions, as demonstrated by snmpset for NET-SNMP-EXTEND-MIB with /bin/sh for command execution.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements used in a Command
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
How developers prevent this class of flaw
- If at all possible, use library calls rather than external processes to recreate the desired functionality.
- If possible, ensure that all external commands called from the program are statically created.
- Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.
More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- packetstormsecurity.com/files/171137/ASUS-ASMB8-iKVM-1.14.51-SNMP-Remote-Root.htmlExploit, Third Party Advisory, VDB Entry
- seclists.org/fulldisclosure/2023/Feb/15Exploit, Mailing List, Third Party Advisory
- nwsec.de/NWSSA-002-2023.txtExploit, Third Party Advisory
Recent Improper Neutralization of Special Elements used in a Command vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 7.3 High severity
- 9.8 Critical severity
- 9.8 Critical severity
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