CVE-2023-22465
Http4s improperly parses User-Agent and Server headers
Impact
### Impact The `User-Agent` and `Server` header parsers are susceptible to a fatal error on certain inputs. In http4s, modeled headers are lazily parsed, so this only applies to services that explicitly request these typed headers. #### v0.21.x ```scala val unsafe: Option[`User-Agent`] = req.headers.get(`User-Agent`) ``` #### v0.22.x, v0.23.x, v1.x ```scala val unsafe: Option[`User-Agent`] = req.headers.get[`User-Agent`] val alsoUnsafe: Option[`Server`] = req.headers.get[Server] ``` ### Patches Fixes are released in 0.21.34, 0.22.15, 0.23.17, and 1.0.0-M38. ### Workarounds #### Use the weakly typed header interface ##### v0.21.x ```scala val safe: Option[Header] = req.headers.get("User-Agent".ci) // but don't do this val unsafe = header.map(_.parsed) ``` ##### v0.22.x, v0.23.x, v1.x ```scala val safe: Option[Header] = req.headers.get(ci"User-Agent") ```
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.http4s:http4s-core_2.13 | >= 0.1.0, < 0.21.34 | 0.21.34 |
| maven | org.http4s:http4s-core_2.10 | >= 0.1.0, <= 0.9.3 | none recorded |
| maven | org.http4s:http4s-core_2.11 | >= 0.1.0, <= 0.21.0-M1 | none recorded |
| maven | org.http4s:http4s-core_2.12 | >= 0.1.0, < 0.21.34 | 0.21.34 |
| maven | org.http4s:http4s-core | >= 1.0.0-M1, <= 1.0.0-M30 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Typelevel | Http4s | from 0.1.0 before 0.21.34 from 0.22.0 before 0.22.15 from 0.23.0 before 0.23.17 Version 1.0.0 |