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.
References
| Link | Resource |
|---|---|
| https://www.tenable.com/security/research/tra-2021-31 | Third Party Advisory |
| https://www.tenable.com/security/research/tra-2021-31 | Third Party Advisory |
Configurations
History
21 Nov 2024, 05:45
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://www.tenable.com/security/research/tra-2021-31 - Third Party Advisory |
Information
Published : 2021-07-19 15:15
Updated : 2024-11-21 05:45
NVD link : CVE-2021-20110
Mitre link : CVE-2021-20110
CVE.ORG link : CVE-2021-20110
JSON object : View
Products Affected
zohocorp
- manageengine_assetexplorer
CWE
CWE-190
Integer Overflow or Wraparound