CVE-2021-27919 Path traversal in n/a
Attackers can cause a denial of service via panic in Go's zip reader when processing archives with path traversal sequences in filenames.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-27919?
CVE-2021-27919 is a medium-severity path traversal vulnerability in Fedoraproject Fedora, published on 11 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
archive/zip in Go 1.16.x before 1.16.1 allows attackers to cause a denial of service (panic) upon attempted use of the Reader.Open API for a ZIP archive in which ../ occurs at the beginning of any filename.
Which versions are affected by CVE-2021-27919?
2 open source packages ship an affected version, including golang and stdlib. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | From 1.16.0 | 1.16.1 |
stdlib Go | From 1.16.0-0 | 1.16.1 |
Products include Fedoraproject Fedora, Golang Go.
How do I fix CVE-2021-27919?
Upgrade golang to 1.16.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-27919 being exploited?
There is no known exploitation of CVE-2021-27919 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as BIT-golang-2021-27919, GHSA-v7gg-6p99-5jxq, GO-2021-0067, UBUNTU-CVE-2021-27919.