CVE-2021-20110 Integer overflow in Manage Engine Asset Explorer Agent
An integer overflow in the Manage Engine Asset Explorer Agent allows remote attackers to execute arbitrary code with SYSTEM privileges via a crafted HTTP response.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-20110?
CVE-2021-20110 is a critical vulnerability in Manage Engine Asset Explorer Agent, published on 19 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-190
Which versions are affected by CVE-2021-20110?
It affects 1 product.
Products include Zohocorp Manageengine Assetexplorer.
How do I fix CVE-2021-20110?
No fix has been published for CVE-2021-20110 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-20110 being exploited?
There is no known exploitation of CVE-2021-20110 in the wild and no public exploit code.
Other vulnerabilities in Manage Engine Asset Explorer Agent
Sources
Also known as GHSA-jj4p-9287-5h8h, UBUNTU-CVE-2021-20110.