CyberSecBulletin
CVE-2023-6919NVD status: Modified

VGuard: Path Traversal: '/../filedir'

Published Updated By the CyberSecBulletin desk

CVE-2023-6919 is a high-severity path traversal: '/../filedir' vulnerability in VGuard from Biges Safe Life Technologies Electronics, 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. The record lists version V500.0003.R008.4011.C0012.B351.C as the first without the flaw, so updating VGuard to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.58% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update VGuard to V500.0003.R008.4011.C0012.B351.C or a later version.
  2. Update Vg-4c1a-lru Firmware to 500.0003.r008.4011.c0012.b351.c or a later version.
  3. Update Vg-4c1a-lrpu Firmware to 500.0003.r008.4011.c0012.b351.c or a later version.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Biges Safe Life Technologies ElectronicsVGuardbefore V500.0003.R008.4011.C0012.B351.CV500.0003.R008.4011.C0012.B351.C
BigesVg-4c1a-lru Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-4c1a-lrpu Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-255a-bf Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-255-bv Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-255-df Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-64c8rd-nvr Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-4c1e-nvr Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-8c1e-nvr Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c
BigesVg-8c1a-lrpu Firmwarebefore 500.0003.r008.4011.c0012.b351.c500.0003.r008.4011.c0012.b351.c

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 CNA (usom.gov.tr).

Official description

Path Traversal: '/../filedir' vulnerability in Biges Safe Life Technologies Electronics Inc. VGuard allows Absolute Path Traversal. This issue affects VGuard: before V500.0003.R008.4011.C0012.B351.C.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Path Traversal: '/../filedir'

The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize /../ sequences that can resolve to a location that is outside of that directory.

How developers prevent this class of flaw

  • Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

More Path Traversal: '/../filedir' vulnerabilities (CWE-25)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

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