CVE-2021-23521 Link Following
Attackers can execute arbitrary code or modify files by crafting a malicious archive with symbolic links that are followed during extraction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-23521?
CVE-2021-23521 is a medium-severity path traversal vulnerability in n/a, published on 31 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
This affects the package juce-framework/JUCE before 6.1.5. This vulnerability is triggered when a malicious archive is crafted with an entry containing a symbolic link. When extracted, the symbolic link is followed outside of the target dir allowing writing arbitrary files on the target host. In some cases, this can allow an attacker to execute arbitrary code. The vulnerable code is in the ZipFile::uncompressEntry function in juce_ZipFile.cpp and is executed when the archive is extracted upon calling uncompressTo() on a ZipFile object.
Weakness: CWE-59
Which versions are affected by CVE-2021-23521?
It affects 1 product.
Products include Juce Juce.
How do I fix CVE-2021-23521?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-23521 being exploited?
There is no known exploitation of CVE-2021-23521 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2021-23521, GHSA-cv9m-jw92-c3v3, SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388608, UBUNTU-CVE-2021-23521.