GHSA-h9mw-grgx-2fhf
sbt vulnerable to arbitrary file write via archive extraction (Zip Slip)
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.scala-sbt:sbt | >= 0.3.4, < 1.9.7 | 1.9.7 |
| Maven | org.scala-sbt:io_2.12 | >= 1.0.0, < 1.9.7 | 1.9.7 |
| Maven | org.scala-sbt:io_2.13 | >= 1.0.0, < 1.9.7 | 1.9.7 |
| Maven | org.scala-sbt:io_3 | >= 1.0.0, < 1.9.7 | 1.9.7 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
Given specially crafted zip or JAR file, `IO.unzip` allows writing of arbitrary file. The follow is an example of a malicious entry:
```
+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys
```
This would have a potential to overwrite `/root/.ssh/authorized_keys`. Within sbt's main code, `IO.unzip` is used in `pullRemoteCache` task and `Resolvers.remote`; however many projects use `IO.unzip(...)` directly to implement custom tasks - https://github.com/search?q=IO.unzip+language%3AScala&type=code&l=Scala&p=1
### Patches
The problem has been patched in https://github.com/sbt/io/pull/360
sbt 1.9.7 is available with the fix.
### Workarounds
A workaround might be use some other library to unzip.
### References
- https://github.com/snyk/zip-slip-vulnerability
- https://security.snyk.io/vuln/SNYK-JAVA-ORGCODEHAUSPLEXUS-31680
- https://github.com/sbt/io/issues/358
References
External links from the advisory. They lead to third-party sites.