CVE-2018-16873

In Go before 1.10.6 and 1.11.x before 1.11.3, 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”.

Bugs

• <https://github.com/golang/go/issues/29230&gt;
• <https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16873&gt;

Notes