CVE-2023-22726 Unrestricted file upload leading to privilege escalation in act
Attackers can exploit path traversal in the artifact server to overwrite arbitrary files, leading to privilege escalation on the host.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-22726?
CVE-2023-22726 is a high-severity path traversal vulnerability in nektos act, published on 20 Jan 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
act is a project which allows for local running of github actions. The artifact server that stores artifacts from Github Action runs does not sanitize path inputs. This allows an attacker to download and overwrite arbitrary files on the host from a Github Action. This issue may lead to privilege escalation. The /upload endpoint is vulnerable to path traversal as filepath is user controlled, and ultimately flows into os.Mkdir and os.Open. The /artifact endpoint is vulnerable to path traversal as the path is variable is user controlled, and the specified file is ultimately returned by the server. This has been addressed in version 0.2.40. Users are advised to upgrade. Users unable to upgrade may, during implementation of Open and OpenAtEnd for FS, ensure to use ValidPath() to check against path traversal or clean the user-provided paths manually.
Which versions are affected by CVE-2023-22726?
3 open source packages ship an affected version, including github.com/nektos/act. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/nektos/act Go | All versions | 0.2.40 |
github.com/nektos/act Go | All versions | 0.2.40 |
github.com/nektos/act Go | All versions | 0.2.40 |
Products include Act Project Act.
How do I fix CVE-2023-22726?
Upgrade github.com/nektos/act to 0.2.40 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2023-22726 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-22726 exists.
Sources
Also known as GHSA-pc99-qmg4-rcff, GO-2023-1504.