OpenScape Session Border Controller (SBC): Improper Neutralization of Argument Delimiters in a Command
CVE-2023-6269 is a critical-severity improper neutralization of argument delimiters in a command vulnerability in OpenScape Session Border Controller (SBC) from Atos Unify, 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. The record lists version V10 R3.4.0 as the first without the flaw, so updating OpenScape Session Border Controller (SBC) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.86% chance of exploitation within 30 days, higher than 80% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update OpenScape Session Border Controller (SBC) to V10 R3.4.0 or a later version.
- Update OpenScape Branch to V10 R3.4.0 or a later version.
- Update OpenScape BCF to V10 R10.12.00 or V10R 11.05.02, whichever matches your release line, or a later version.
- Read the advisory on networks.unify.com for workarounds and exact fixed builds.
- 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 |
|---|---|---|---|
| Atos Unify | OpenScape Session Border Controller (SBC) | before V10 R3.4.0 | V10 R3.4.0 |
| Atos Unify | OpenScape Branch | before V10 R3.4.0 | V10 R3.4.0 |
| Atos Unify | OpenScape BCF | before V10 R10.12.00; before V10R 11.05.02 | V10 R10.12.00, V10R 11.05.02 |
| Atos | Unify Openscape Bcf | 10 up to, but not including, 10r10.12.00 | 10r10.12.00 |
| Atos | Unify Openscape Branch | 10 up to, but not including, 10r3.4.0 | 10r3.4.0 |
| Atos | Unify Openscape Session Border Controller | 10 up to, but not including, 10r3.4.0 | 10r3.4.0 |
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
- 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.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 10.0 | Critical | CNA |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
An argument injection vulnerability has been identified in the administrative web interface of the Atos Unify OpenScape products "Session Border Controller" (SBC) and "Branch", before version V10 R3.4.0, and OpenScape "BCF" before versions V10R10.12.00 and V10R11.05.02. This allows an unauthenticated attacker to gain root access to the appliance via SSH (scope change) and also bypass authentication for the administrative interface and gain access as an arbitrary (administrative) user.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Argument Delimiters in a Command
The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.
How developers prevent this class of flaw
- Understand all the potential areas where untrusted inputs can enter your product: parameters or arguments, cookies, anything read from the network, environment variables, request headers as well as content, URL components, e-mail, files, databases, and any external systems that provide data to the application. Perform input validation at well-defined interfaces.
- Directly convert your input type into the expected data type, such as using a conversion function that translates a string into a number. After converting to the expected data type, ensure that the input's values fall within the expected range of allowable values and that multi-field consistencies are maintained.
- When exchanging data between components, ensure that both components are using the same character encoding. Ensure that the proper encoding is applied at each interface. Explicitly set the encoding you are using whenever the protocol allows you to do so.
More Improper Neutralization of Argument Delimiters in a Command vulnerabilities (CWE-88)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- r.sec-consult.com/unifyrootExploit, Third Party Advisory
Other references
Recent Improper Neutralization of Argument Delimiters in a Command vulnerabilities
- 7.8 High severity
- 9.1 Critical severity
- 7.8 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.8 High severity
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