vtech_nb403-il: Improper Authentication
CVE-2022-47848 is a high-severity improper authentication vulnerability in vtech_nb403-il from Bezeq, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected vtech_nb403-il versions: bz_2.02.07.09.13t; bz_2.02.07.09.09t. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.99% chance of exploitation within 30 days, higher than 63% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of vtech_nb403-il 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 |
|---|---|---|---|
| Bezeq | vtech_nb403-il | bz_2.02.07.09.13t; bz_2.02.07.09.09t | Not stated |
| Bezeq | Vtech Nb403-il Firmware | bz_2.02.07.09.13.01 | Not stated |
| Bezeq | Vtech Iad604-il Firmware | bz_2.02.07.09.09t; bz_2.02.07.09.13.01; bz_2.02.07.09.13t | 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
- 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
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.
Official description
An issue was discovered in Bezeq Vtech NB403-IL version BZ_2.02.07.09.13.01 and Vtech IAD604-IL versions BZ_2.02.07.09.13.01, BZ_2.02.07.09.13T, and BZ_2.02.07.09.09T, allows remote attackers to gain sensitive information via rootDesc.xml page of the UPnP service.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How developers prevent this class of flaw
- Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- 00xbyte.github.io/posts/bezeq-router-auth-bypass/Exploit, Third Party Advisory
Recent Improper Authentication vulnerabilities
- 7.5 High severity
- 7.8 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.8 High severity
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