CVE-2021-31154 Permissions bypass in pleaser
A local attacker can gain root privileges by exploiting predictable temporary filenames in the pleaseedit library via a symlink attack.
- 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-2021-31154?
CVE-2021-31154 is a high-severity path traversal vulnerability in n/a, published on 27 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
pleaseedit in please before 0.4 uses predictable temporary filenames in /tmp and the target directory. This allows a local attacker to gain full root privileges by staging a symlink attack.
Weakness: CWE-668
Which versions are affected by CVE-2021-31154?
3 open source packages ship an affected version, including pleaser. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pleaser crates.io | All versions | 0.4.0 |
pleaser crates.io | All versions | 0.4.0 |
pleaser crates.io | From 0.0.0-0 | 0.4.0 |
Products include Pleaseedit Project Pleaseedit.
How do I fix CVE-2021-31154?
Upgrade pleaser to 0.4.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-31154 being exploited?
There is no known exploitation of CVE-2021-31154 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2021-31154, GHSA-pp74-39w2-v4w9, RUSTSEC-2021-0102.