CVE-2020-28367: Arbitrary code execution via the go command with cgo in cmd/go
First published: Thu Nov 12 2020(Updated: )
An input validation vulnerability was found in Go. If cgo is specified in a Go file, it is possible to bypass the validation of arguments to the gcc compiler. This flaw allows an attacker to create a malicious repository that can execute arbitrary code when downloaded and run via `go get` or `go build` while building a Go project. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/openshift-serverless-clients | <0:0.18.4-2.el8 | 0:0.18.4-2.el8 |
| redhat/go-toolset | <1.14-0:1.14.12-1.el7_9 | 1.14-0:1.14.12-1.el7_9 |
| redhat/go-toolset | <1.14-golang-0:1.14.12-1.el7_9 | 1.14-golang-0:1.14.12-1.el7_9 |
| redhat/go | <1.15.5 | 1.15.5 |
| redhat/go | <1.14.12 | 1.14.12 |
| IBM Cloud Pak for Security | <=1.10.0.0 - 1.10.11.0 | |
| IBM QRadar Suite Software | <=1.10.12.0 - 1.10.16.0 | |
| Go | <1.14.12 | |
| Go | >=1.15<1.15.5 |
Remedy
If it's possible to confirm that the go project being built does not rely on any cgo code in the included dependencies, the env variable CGO_ENABLED=0 can be specified when using either `go get` or `go build`. For example: CGO_ENABLED=0 go get github.com/someproject This will not stop the files being downloaded but will stop any automatic complication of the cgo code, including inlined in the go file and separate .c files. Of course, this will only be effective if cgo is not relied upon in a given dependency and may not be appropriate in all scenarios.
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Reference Links
- https://exchange.xforce.ibmcloud.com/vulnerabilities/191979
- https://www.ibm.com/support/pages/node/7080058 (Advisory)
- https://go.dev/cl/267277
- https://go.dev/issue/42556
- https://go.googlesource.com/go/+/da7aa86917811a571e6634b45a457f918b8e6561
- https://groups.google.com/g/golang-announce/c/NpBGTTmKzpM
- https://lists.debian.org/debian-lts-announce/2023/04/msg00021.html
- https://pkg.go.dev/vuln/GO-2022-0476
- https://groups.google.com/g/golang-announce/c/NpBGTTmKzpM/m/fLguyiM2CAAJ
- https://github.com/golang/go/issues/42556
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1897648
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1897647
- https://github.com/golang/go/commit/da7aa86917811a571e6634b45a457f918b8e6561
- https://access.redhat.com/errata/RHSA-2020:5333
- https://access.redhat.com/errata/RHSA-2020:5493
- https://access.redhat.com/security/cve/cve-2020-28367
- https://access.redhat.com/errata/RHSA-2021:0145
- https://access.redhat.com/errata/RHSA-2021:0146
- https://bugzilla.redhat.com/show_bug.cgi?id=1897646
- https://www.cve.org/CVERecord?id=CVE-2020-28367 https://nvd.nist.gov/vuln/detail/CVE-2020-28367 https://groups.google.com/g/golang-announce/c/NpBGTTmKzpM/m/fLguyiM2CAAJ
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2020-28367?
CVE-2020-28367 is a code injection vulnerability in the go command with cgo before Go 1.14.12 and Go 1.15.5 that allows arbitrary code execution.
How does CVE-2020-28367 impact Go?
CVE-2020-28367 allows an attacker to create a malicious repository that can execute arbitrary code when downloaded and run via `go get` or `go build`.
What is the severity of CVE-2020-28367?
CVE-2020-28367 has a severity rating of high (7 out of 10).
Which versions of Go are affected by CVE-2020-28367?
CVE-2020-28367 affects Go versions before Go 1.14.12 and Go 1.15.5.
How can I mitigate the risk of CVE-2020-28367?
To mitigate the risk of CVE-2020-28367, it is recommended to update to Go 1.14.12 or Go 1.15.5.
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