CyberSecBulletin
CVE-2022-31483NVD status: Modified

LNL-X2210: Improper Limitation of a Pathname to a Restricted Directory

Published Updated By the CyberSecBulletin desk

CVE-2022-31483 is a high-severity improper limitation of a pathname to a restricted directory vulnerability in LNL-X2210 from LenelS2, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 1.271 as the first without the flaw, so updating LNL-X2210 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.83% chance of exploitation within 30 days, higher than 79% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update LNL-X2210 to 1.271 or a later version.
  2. Update LNL-X2220 to 1.271 or a later version.
  3. Update LNL-X3300 to 1.271 or a later version.
  4. Read the advisory on corporate.carrier.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
LenelS2LNL-X2210ALL up to, but not including, 1.2711.271
LenelS2LNL-X2220ALL up to, but not including, 1.2711.271
LenelS2LNL-X3300ALL up to, but not including, 1.2711.271
LenelS2LNL-X4420ALL up to, but not including, 1.2711.271
LenelS2LNL-4420ALL up to, but not including, 1.2711.271
LenelS2S2-LP-1501ALL up to, but not including, 1.2711.271
LenelS2S2-LP-1502ALL up to, but not including, 1.2711.271
LenelS2S2-LP-2500ALL up to, but not including, 1.2711.271
LenelS2S2-LP-4502ALL up to, but not including, 1.2711.271
HID MercuryLP1501ALL up to, but not including, 1.2711.271
HID MercuryLP1502ALL up to, but not including, 1.2711.271
HID MercuryLP2500ALL up to, but not including, 1.2711.271
HID MercuryLP4502ALL up to, but not including, 1.2711.271
HID MercuryEP4502ALL up to, but not including, 1.2711.271
HidglobalLp1501 Firmwarebefore 1.2711.271
HidglobalLp1502 Firmwarebefore 1.2711.271
HidglobalLp2500 Firmwarebefore 1.2711.271
HidglobalLp4502 Firmwarebefore 1.2711.271
HidglobalEp4502 Firmwarebefore 1.2711.271
CarrierLenels2 Lnl-4420 Firmwarebefore 1.2711.271
CarrierLenels2 Lnl-x2210 Firmwarebefore 1.2711.271
CarrierLenels2 Lnl-x2220 Firmwarebefore 1.2711.271
CarrierLenels2 Lnl-x3300 Firmwarebefore 1.2711.271
CarrierLenels2 Lnl-x4420 Firmwarebefore 1.2711.271
CarrierLenels2 S2-lp-1501 Firmwarebefore 1.2711.271

Version data comes from the organisation that assigned the CVE; 3 further products are omitted here. 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
LowA basic user account is enough.
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:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.19.1CriticalCNA (carrier.com)
CVSS 3.18.8HighNVD
CVSS 2.09.0HighNVD

Official description

An authenticated attacker can upload a file with a filename including “..” and “/” to achieve the ability to upload the desired file anywhere on the filesystem. This vulnerability impacts products based on HID Mercury Intelligent Controllers LP1501, LP1502, LP2500, LP4502, and EP4502 which contain firmware versions prior to 1.271. This allows a malicious actor to overwrite sensitive system files and install a startup service to gain remote access to the underlaying Linux operating system with root privileges.

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

The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

How developers prevent this class of flaw

  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • 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.

More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in LNL-X2210

All LNL-X2210 vulnerabilities

Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities

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