Cisco RoomOS Software: Improper Link Resolution Before File Access
CVE-2023-20008 is a high-severity improper link resolution before file access vulnerability in Cisco RoomOS Software from Cisco, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. Affected Cisco RoomOS Software versions: RoomOS 10.3.2.0; RoomOS 10.3.4.0; RoomOS 10.8.2.5, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Cisco RoomOS Software you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on sec.cloudapps.cisco.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Cisco | Cisco RoomOS Software | RoomOS 10.3.2.0; RoomOS 10.3.4.0; RoomOS 10.8.2.5; RoomOS 10.11.5.2; RoomOS 10.8.4.0; RoomOS 10.11.3.0; RoomOS 10.15.3.0 | Not stated |
| Cisco | Cisco TelePresence Endpoint Software (TC/CE) | CE9.0.1; CE9.1.1; CE9.1.2; CE9.1.3; CE9.1.4; CE9.1.5; CE9.1.6; CE9.10.1; and 32 more ranges | Not stated |
| Cisco | Roomos | 10.3.2.0; 10.3.4.0; 10.8.2.5; 10.8.4.0; 10.11.3.0; 10.11.5.2; 10.15.3.0 | Not stated |
| Cisco | Telepresence Collaboration Endpoint | 8.0.0; 8.0.1; 8.1.0; 8.1.1; 8.2.0; 8.2.1; 8.2.2; 8.3.0; and 32 more ranges | Not stated |
| Cisco | Telepresence Tc | 7.3.5; 7.3.6; 7.3.7; 7.3.9; 7.3.13; 7.3.21 | Not stated |
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
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 4.4 | Medium | CNA (cisco.com) |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
A vulnerability in the CLI of Cisco TelePresence CE and RoomOS Software could allow an authenticated, local attacker to overwrite arbitrary files on the local system of an affected device. This vulnerability is due to improper access controls on files that are in the local file system. An attacker could exploit this vulnerability by placing a symbolic link in a specific location on the local file system of an affected device. A successful exploit could allow the attacker to overwrite arbitrary files on the affected device.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Link Resolution Before File Access
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
How developers prevent this class of flaw
- Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
More Improper Link Resolution Before File Access vulnerabilities (CWE-59)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in Cisco RoomOS Software
- 7.5 High severity
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
- 8.8 High severity
Recent Improper Link Resolution Before File Access vulnerabilities
- 8.1 High severity
- 7.8 High severity
- 8.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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