CVE-2021-21798 Use after free in Nitro Pro
A use-after-free vulnerability in Nitro Pro PDF allows attackers to execute arbitrary code by tricking users into opening a specially crafted document.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-21798?
CVE-2021-21798 is a high-severity use after free vulnerability in Nitro Pro, published on 15 Sep 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An exploitable return of stack variable address vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause a stack variable to go out of scope, resulting in the application dereferencing a stale pointer. This can lead to code execution under the context of the application. An attacker can convince a user to open a document to trigger the vulnerability.
Weakness: CWE-562
Which versions are affected by CVE-2021-21798?
It affects 1 product.
Products include Gonitro Nitro Pro.
How do I fix CVE-2021-21798?
No fix has been published for CVE-2021-21798 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-21798 being exploited?
There is no known exploitation of CVE-2021-21798 in the wild and no public exploit code.
Other vulnerabilities in Nitro Pro
Sources
Also known as GHSA-4vm8-m2w2-wpqm.