CVE-2022-29878: siemens 7kg8500-0aa00-0aa0_firmware Authentication Bypass by Capture-replay

Vulnerability summary

CVE-2022-29878 is a high (CVSS 7.5) Authentication Bypass by Capture-replay vulnerability in siemens 7kg8500-0aa00-0aa0_firmware. EPSS estimates a 1.12% chance of exploitation in the next 30 days, higher than 65.6% of scored vulnerabilities.

Timeline

1. 10-05-2022
   PublishedVulnerability first disclosed.
2. 09-12-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability has been identified in SICAM T (All versions < V3.0). Affected devices use a limited range for challenges that are sent during the unencrypted challenge-response communication. An unauthenticated attacker could capture a valid challenge-response pair generated by a legitimate user, and request the webpage repeatedly to wait for the same challenge to reappear for which the correct response is known. This could allow the attacker to access the management interface of the device.

• CWE-294Authentication Bypass by Capture-replayA capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).