CVE-2021-20109 Memory corruption in Manage Engine Asset Explorer Agent
A heap overflow in the Asset Explorer Agent allows remote attackers to execute arbitrary code or cause denial of service via a large POST payload.
- 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-2021-20109?
CVE-2021-20109 is a high-severity memory corruption 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 the Asset Explorer agent 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 AEAgent.cpp, the agent responding back over HTTP is vulnerable to a Heap Overflow if the POST payload response is too large. The POST payload response is converted to Unicode using vswprintf. This is written to a buffer only 0x2000 bytes big. If POST payload is larger, then heap overflow will occur.
Weakness: CWE-787
Which versions are affected by CVE-2021-20109?
It affects 1 product.
Products include Zohocorp Manageengine Assetexplorer.
How do I fix CVE-2021-20109?
No fix has been published for CVE-2021-20109 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-20109 being exploited?
There is no known exploitation of CVE-2021-20109 in the wild and no public exploit code.
Other vulnerabilities in Manage Engine Asset Explorer Agent
Sources
Also known as GHSA-3683-2c96-6v5c, UBUNTU-CVE-2021-20109.