InduSoft Web Studio NTWebServer Directory Traversal Vulnerability

Directory traversal vulnerability in NTWebServer in InduSoft Web Studio 7.1 before SP2 Patch 4 allows remote attackers to read administrative passwords in APP files, and consequently execute arbitrary code, via unspecified web requests.

CheckOps priority index

8.6/10 Patch within 24 h

Severity9.8

Probability7.5

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 74.7% higher than 99.5% of CVEs

CVSS 3.1 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 1,663 days 15 Apr 2022

CISA due date 06 May 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)15 Apr 2022
Exploited in EUVD (ENISA)15 Apr 2022
Used by ransomwareno
EPSS above 10 %74.7%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Affected products

Web Studio

Affected versions

Weaknesses (CWE)

CWE-22

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

25 Apr 2014
Published
15 Apr 2022
Exploitation reported (ENISA)
15 Apr 2022
Added to the KEV catalog
06 May 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 74.7%