Screen SFT DAB Series - Compact Radio DAB…: Session Fixation
CVE-2023-53776 is a high-severity session fixation vulnerability in Screen SFT DAB Series - Compact Radio DAB Transmitter from DB Elettronica Telecomunicazioni SpA, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected Screen SFT DAB Series - Compact Radio DAB Transmitter versions: 1.9.3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.51% 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 Screen SFT DAB Series - Compact Radio DAB Transmitter you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| DB Elettronica Telecomunicazioni SpA | Screen SFT DAB Series - Compact Radio DAB Transmitter | 1.9.3 | Not stated |
| Dbbroadcast | Sft Dab 600/c Firmware | 1.9.3 | 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
- AdjacentThe attacker must be on the same local network segment.
- 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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA (vulncheck.com) |
| CVSS 3.1 | 8.8 | High | NVD |
Official description
Screen SFT DAB 1.9.3 contains an authentication bypass vulnerability that allows attackers to exploit weak session management by reusing IP-bound session identifiers. Attackers can issue unauthorized requests to the device management API by leveraging the session binding mechanism to perform critical operations on the transmitter.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Session Fixation
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
How developers prevent this class of flaw
- Invalidate any existing session identifiers prior to authorizing a new user session.
- For platforms such as ASP that do not generate new values for sessionid cookies, utilize a secondary cookie. In this approach, set a secondary cookie on the user's browser to a random value and set a session variable to the same value. If the session variable and the cookie value ever don't match, invalidate the session, and force the user to log on again.
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- vulncheck.com/advisories/screen-sft-dab-authentication-bypass-via-session-management-weaknessThird Party Advisory
- zeroscience.mk/en/vulnerabilities/ZSL-2023-5775.phpThird Party Advisory
Technical write-ups (may include proof of concept)
- exploit-db.com/exploits/51459Exploit, Third Party Advisory
Other references
- dbbroadcast.comProduct
- dbbroadcast.com/products/radio/sft-dab-series-compact-air/Product
- screen.itProduct
Other vulnerabilities in Screen SFT DAB Series - Compact Radio DAB Transmitter
- 8.1 High severity
- 9.8 Critical severity
Recent Session Fixation vulnerabilities
- 8.8 High severity
- 7.3 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.8 High severity
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