Vulnerability · Published Jan 5, 2021 · Assigned by GitHub_M
CVE-2021-21234Directory Traversal
High 7.7
In plain English
A high-severity path traversal in spring-boot-actuator-logview from lukashinsch. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 21.0% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
spring-boot-actuator-logview in a library that adds a simple logfile viewer as spring boot actuator endpoint. It is maven package "eu.hinsch:spring-boot-actuator-logview". In spring-boot-actuator-logview before version 0.2.13 there is a directory traversal vulnerability. The nature of this library is to expose a log file directory via admin (spring boot actuator) HTTP endpoints. Both the filename to view and a base folder (relative to the logging folder root) can be specified via request parameters. While the filename parameter was checked to prevent directory traversal exploits (so that `filename=../somefile` would not work), the base folder parameter was not sufficiently checked, so that `filename=somefile&base=../` could access a file outside the logging base directory). The vulnerability has been patched in release 0.2.13. Any users of 0.2.12 should be able to update without any issues as there are no other changes in that release. There is no workaround to fix the vulnerability other than updating or removing the dependency. However, removing read access of the user the application is run with to any directory not required for running the application can limit the impact. Additionally, access to the logview endpoint can be limited by deploying the application behind a reverse proxy.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | eu.hinsch:spring-boot-actuator-logview | 0.2.13 | GHSA-p4q6-qxjx-8jgp |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| lukashinsch | spring-boot-actuator-logview | < 0.2.13 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
References
- https://github.com/lukashinsch/spring-boot-actuator-logview/security/advisories/GHSA-p4q6-qxjx-8jgp x_refsource_CONFIRM
- https://github.com/lukashinsch/spring-boot-actuator-logview/commit/1c76e1ec3588c9f39e1a94bf27b5ff56eb8b17d6 x_refsource_MISC
- https://github.com/lukashinsch/spring-boot-actuator-logview/commit/760acbb939a8d1f7d1a7dfcd51ca848eea04e772 x_refsource_MISC
- https://search.maven.org/artifact/eu.hinsch/spring-boot-actuator-logview x_refsource_MISC