Firewall: Session Fixation
CVE-2022-40630 is a critical-severity session fixation vulnerability in Firewall from Tacitine, 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 versions EN6200-PRIME QUAD-35*, EN6200-PRIME QUAD-100* as the first without the flaw, so updating Firewall to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.06% chance of exploitation within 30 days, higher than 65% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Firewall to EN6200-PRIME QUAD-35* or EN6200-PRIME QUAD-100*, whichever matches your release line, or a later version.
- Update En6200-prime Quad-35 Firmware to 22.21.2 or a later version.
- Update En6200-prime Quad-100 Firmware to 22.21.2 or a later version.
- Read the advisory on tacitine.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 |
|---|---|---|---|
| Tacitine | Firewall | 19.1.1 up to, but not including, EN6200-PRIME QUAD-35*; 19.1.1 up to, but not including, EN6200-PRIME QUAD-100* | EN6200-PRIME QUAD-35*, EN6200-PRIME QUAD-100* |
| Tacitine | En6200-prime Quad-35 Firmware | 19.1.1 up to, but not including, 22.21.2 | 22.21.2 |
| Tacitine | En6200-prime Quad-100 Firmware | 19.1.1 up to, but not including, 22.21.2 | 22.21.2 |
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 | 6.5 | Medium | CNA (cert-in.org.in) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
This vulnerability exists in Tacitine Firewall, all versions of EN6200-PRIME QUAD-35 and EN6200-PRIME QUAD-100 between 19.1.1 to 22.20.1 (inclusive), due to improper session management in the Tacitine Firewall web-based management interface. An unauthenticated remote attacker could exploit this vulnerability by sending a specially crafted http request on the targeted device. Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to perform session fixation on the targeted device.
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: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2022-0363Third Party Advisory
Other vulnerabilities in Firewall
- 7.5 High severity
- 9.8 Critical severity
Recent Session Fixation vulnerabilities
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.1 High severity
- 8.8 High severity
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