CVE-2021-32742 Untrusted data fed into `Data.init(base32Encoded:)` can result in exposing server memory and/or crash
Attackers can crash the server or expose memory by feeding untrusted data to the base32 decoding function in the Vapor Swift framework.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32742?
CVE-2021-32742 is a high-severity denial of service vulnerability in vapor, published on 9 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Vapor is a web framework for Swift. In versions 4.47.1 and prior, bug in the `Data.init(base32Encoded:)` function opens up the potential for exposing server memory and/or crashing the server (Denial of Service) for applications where untrusted data can end up in said function. Vapor does not currently use this function itself so this only impact applications that use the impacted function directly or through other dependencies. The vulnerability is patched in version 4.47.2. As a workaround, one may use an alternative to Vapor's built-in `Data.init(base32Encoded:)`.
Weakness: CWE-502
Which versions are affected by CVE-2021-32742?
2 open source packages ship an affected version, including github.com/vapor/vapor. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/vapor/vapor SwiftURL | All versions | 4.47.2 |
github.com/vapor/vapor SwiftURL | All versions | 4.47.2 |
Products include Vapor Project Vapor.
How do I fix CVE-2021-32742?
Upgrade github.com/vapor/vapor to 4.47.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-32742 being exploited?
There is no known exploitation of CVE-2021-32742 in the wild and no public exploit code.
Other vulnerabilities in vapor
Sources
Also known as GHSA-pqwh-c2f3-vxmq.