CVE-2018-16873
Remote command execution via "go get" with "-u" flag in cmd/go
Description
The "go get" command is vulnerable to remote code execution when executed with the -u flag and the import path of a malicious Go package, or a package that imports it directly or indirectly. Specifically, it is only vulnerable in GOPATH mode, but not in module mode (the distinction is documented at https://golang.org/cmd/go/#hdr-Module_aware_go_get). Using custom domains, it's possible to arrange things so that a Git repository is cloned to a folder named ".git" by using a vanity import path that ends with "/.git". If the Git repository root contains a "HEAD" file, a "config" file, an "objects" directory, a "refs" directory, with some work to ensure the proper ordering of operations, "go get -u" can be tricked into considering the parent directory as a repository root, and running Git commands on it. That will use the "config" file in the original Git repository root for its configuration, and if that config file contains malicious commands, they will execute on the system running "go get -u". Note that forbidding import paths with a .git element might not be sufficient to mitigate this issue, as on certain systems there can be other aliases for VCS state folders.
How to fix CVE-2018-16873
To remediate CVE-2018-16873, upgrade the affected package to a fixed version below.
- —upgrade to 1.10.6 or later
Is CVE-2018-16873 being exploited?
Likely — EPSS is 56.8%, placing CVE-2018-16873 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (1)
- from 0, < 1.10.6, >= 1.11.0-0, < 1.11.3