CVE-2020-27195: Github.com/hashicorp/nomad Use After Free Vulnerability
CRITICALCVE-2020-27195 is a CRITICAL (CVSS 9.1) use after free vulnerability (CWE-416: Use After Free) affecting Github.com/hashicorp/nomad libraries in the Go ecosystem. The issue involves use after free in hashicorp nomad. Remediation is available by upgrading affected packages to version 0.10.6, 0.11.5, 0.12.6.
CVE-2020-27195 at a Glance
Security Impact
CVSS: 9.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2020-27195
To remediate this vulnerability, upgrade all affected Github.com/hashicorp/nomad dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/hashicorp/nomad to 0.10.6Upgrade github.com/hashicorp/nomad to 0.11.5Upgrade github.com/hashicorp/nomad to 0.12.6Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/hashicorp/nomadHow to Check if You Are Affected
To determine whether your application is affected by CVE-2020-27195, inspect your project dependencies for Github.com/hashicorp/nomad:
inspect dependencies for github.com/hashicorp/nomadAnalyze the terminal output to locate any version of Github.com/hashicorp/nomad in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.10.6), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. In Github.com/hashicorp/nomad, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2020-27195 Affected Github.com/hashicorp/nomad Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/hashicorp/nomad
|
Go |
≥ 0.9.0
< 0.10.6
|
0.10.6
|
|
github.com/hashicorp/nomad
|
Go |
≥ 0.11.0
< 0.11.5
|
0.11.5
|
|
github.com/hashicorp/nomad
|
Go |
≥ 0.12.0
< 0.12.6
|
0.12.6
|
References
Frequently Asked Questions
What is CVE-2020-27195?
Which Github.com/hashicorp/nomad versions are affected?
What version fixes CVE-2020-27195?
Is github.com/hashicorp/nomad affected?
What is the CVSS score of CVE-2020-27195?
What CWE is associated with CVE-2020-27195?
How can I check Go dependencies for CVE-2020-27195?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-77cr-6gr8-7rr9",
"modified" : "2023-10-02T15:17:55Z",
"published" : "2022-02-15T01:57:18Z",
"aliases" : [ "CVE-2020-27195" ],
"summary" : "Use After Free in HashiCorp Nomad",
"details" : "HashiCorp Nomad and Nomad Enterprise version 0.9.0 up to 0.12.5 client file sandbox feature can be subverted using either the template or artifact stanzas. Fixed in 0.12.6, 0.11.5, and 0.10.6",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/hashicorp/nomad"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.9.0"
}, {
"fixed" : "0.10.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/hashicorp/nomad"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.11.0"
}, {
"fixed" : "0.11.5"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/hashicorp/nomad"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.12.0"
}, {
"fixed" : "0.12.6"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-27195"
}, {
"type" : "WEB",
"url" : "https://github.com/hashicorp/nomad/issues/9129"
}, {
"type" : "WEB",
"url" : "https://github.com/hashicorp/nomad/pull/9139"
}, {
"type" : "WEB",
"url" : "https://github.com/hashicorp/nomad/blob/master/CHANGELOG.md#0126-october-21-2020"
}, {
"type" : "PACKAGE",
"url" : "https://pkg.go.dev/github.com/hashicorp/nomad/client/allocrunner/taskrunner/template"
}, {
"type" : "WEB",
"url" : "https://www.nomadproject.io/downloads"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-416" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2021-05-12T21:58:02Z",
"nvd_published_at" : null
}
}