CVE-2021-20110: Integer Overflow
First published: Mon Jul 19 2021(Updated: )
Due to Manage Engine Asset Explorer Agent 1.0.34 not validating HTTPS certificates, an attacker on the network can statically configure their IP address to match the Asset Explorer's Server IP address. This will allow an attacker to send a NEWSCAN request to a listening agent on the network as well as receive the agent's HTTP request verifying its authtoken. In httphandler.cpp, the agent reaching out over HTTP is vulnerable to an Integer Overflow, which can be turned into a Heap Overflow allowing for remote code execution as NT AUTHORITY/SYSTEM on the agent machine. The Integer Overflow occurs when receiving POST response from the Manage Engine server, and the agent calling "HttpQueryInfoW" in order to get the "Content-Length" size from the incoming POST request. This size is taken, but multiplied to a larger amount. If an attacker specifies a Content-Length size of 1073741823 or larger, this integer arithmetic will wrap the value back around to smaller integer, then calls "calloc" with this size to allocate memory. The following API "InternetReadFile" will copy the POST data into this buffer, which will be too small for the contents, and cause heap overflow.
Credit: vulnreport@tenable.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Zohocorp Manageengine Assetexplorer | =1.0.34 |
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Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-20110.
What is the severity of CVE-2021-20110?
CVE-2021-20110 has a severity rating of 9.8 (critical).
What software is affected by CVE-2021-20110?
Manage Engine Asset Explorer Agent version 1.0.34 is affected by CVE-2021-20110.
How does CVE-2021-20110 impact the system?
CVE-2021-20110 allows an attacker on the network to send a NEWSCAN request to a listening agent, potentially leading to unauthorized access or other malicious activities.
Is there a fix for CVE-2021-20110?
At the time of writing, there is no available fix or patch for CVE-2021-20110. It is recommended to contact the vendor for further information and mitigation steps.
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