Cisco Adaptive Security Appliance (ASA) Software: Insufficient Verification of Data Authenticity
CVE-2022-20829 is a high-severity insufficient verification of data authenticity vulnerability in Cisco Adaptive Security Appliance (ASA) Software from Cisco, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 3.74% chance of exploitation within 30 days, which is in the top 9.96% of all scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Isa 3000 Firmware to 9.18.2 or a later version.
- Update Asa 5585-x Firmware to 9.18.2 or a later version.
- Update Asa 5512-x Firmware to 9.18.2 or a later version.
- Read the advisory on tools.cisco.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software | Not specified in the record | Not stated |
| Cisco | Isa 3000 Firmware | before 9.18.2 | 9.18.2 |
| Cisco | Asa 5585-x Firmware | before 9.18.2 | 9.18.2 |
| Cisco | Asa 5512-x Firmware | before 9.18.2 | 9.18.2 |
| Cisco | Asa 5515-x Firmware | before 9.18.2 | 9.18.2 |
| Cisco | Adaptive Security Device Manager | before 7.18.1.150 | 7.18.1.150 |
Version data comes from the organisation that assigned the CVE. 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
- HighAdministrator-level access is required first.
- 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:H/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.1 | Critical | CNA (cisco.com) |
| CVSS 3.1 | 7.2 | High | NVD |
| CVSS 2.0 | 9.0 | High | NVD |
Official description
A vulnerability in the packaging of Cisco Adaptive Security Device Manager (ASDM) images and the validation of those images by Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker with administrative privileges to upload an ASDM image that contains malicious code to a device that is running Cisco ASA Software. This vulnerability is due to insufficient validation of the authenticity of an ASDM image during its installation on a device that is running Cisco ASA Software. An attacker could exploit this vulnerability by installing a crafted ASDM image on the device that is running Cisco ASA Software and then waiting for a targeted user to access that device using ASDM. A successful exploit could allow the attacker to execute arbitrary code on the machine of the targeted user with the privileges of that user on that machine. Notes: To successfully exploit this vulnerability, the attacker must have administrative privileges on the device that is running Cisco ASA Software. Potential targets are limited to users who manage the same device that is running Cisco ASA Software using ASDM. Cisco has released and will release software updates that address this vulnerability.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Insufficient Verification of Data Authenticity
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
More Insufficient Verification of Data Authenticity vulnerabilities (CWE-345)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Technical write-ups (may include proof of concept)
- github.com/jbaines-r7/thewayExploit, Third Party Advisory
- rapid7.com/blog/post/2022/08/11/rapid7-discovered-vulnerabilities-in-cisco-asa-asdm-and-firepower-services-so…Exploit, Third Party Advisory
Other vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software
- 9.0 Critical severity
- 8.6 High severity
- 8.6 High severity
- 8.5 High severity
- 7.7 High severity
- 8.6 High severity
Recent Insufficient Verification of Data Authenticity vulnerabilities
- 10.0 High severity
- 10.0 High severity
- 7.8 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.8 High severity
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