PT-2021-17981 · Bab Technologie Gmbh · Eibport V3

Psytester · Published 2021-09-09 · Updated 2021-09-20 · CVE-2021-28911

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions: BAB TECHNOLOGIE GmbH eibPort V3 versions prior to 3.9.1

Description: The issue allows unauthenticated attackers to access the /tmp path, which contains sensitive data such as the device serial number. This information can be used to self-calculate a possible loginId, enabling a brute force attack against the BMX interface. This can be part of an attack chain to gain SSH root access.

Recommendations: For versions prior to 3.9.1, update to version 3.9.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the /tmp path and the BMX interface to minimize the risk of exploitation.

Fix

Improper Restriction of Excessive Authentication Attempts

Incorrect Authorization

Weakness Enumeration

CWE-307

CWE-863

Related Identifiers

CVE-2021-28911

Affected Products

Eibport V3

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2021-28911 · Security Note
• https://osv.dev/vulnerability/CVE-2021-28911 · Vendor Advisory
• https://psytester.github.io/CVE-2021-28911 · Note