A vulnerability, which was classified as critical, has been found in PRTG Network Monitor up to 18.2.40 (Network Management Software). This issue affects an unknown code block of the file /public/login.htm. The manipulation as part of a HTTP Request leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write privileges (including administrator). A remote unauthenticated user can craft an HTTP request and override attributes of the 'include' directive in /public/login.htm and perform a Local File Inclusion attack, by including /api/addusers and executing it. By providing the 'id' and 'users' parameters, an unauthenticated attacker can create a user with read-write privileges (including administrator).

The bug was discovered 10/26/2018. The weakness was published 11/21/2018 (Website). It is possible to read the advisory at ptsecurity.com. The identification of this vulnerability is CVE-2018-19410 since 11/21/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 26 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:public/login.htm it is possible to find vulnerable targets with Google Hacking. The commercial vulnerability scanner Qualys is able to test this issue with plugin 13352 (PRTG Network Monitor Multiple Vulnerabilites).

Upgrading to version 18.2.40.1683 eliminates this vulnerability.

Similar entry is available at 127056.

Productinfo

Type

• Network Management Software

Name

• PRTG Network Monitor

Version

• 18.2.0
• 18.2.1
• 18.2.2
• 18.2.3
• 18.2.4
• 18.2.5
• 18.2.6
• 18.2.7
• 18.2.8
• 18.2.9
• 18.2.10
• 18.2.11
• 18.2.12
• 18.2.13
• 18.2.14
• 18.2.15
• 18.2.16
• 18.2.17
• 18.2.18
• 18.2.19
• 18.2.20
• 18.2.21
• 18.2.22
• 18.2.23
• 18.2.24
• 18.2.25
• 18.2.26
• 18.2.27
• 18.2.28
• 18.2.29
• 18.2.30
• 18.2.31
• 18.2.32
• 18.2.33
• 18.2.34
• 18.2.35
• 18.2.36
• 18.2.37
• 18.2.38
• 18.2.39
• 18.2.40

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