CVE-2021-21289: Mechanize Command Injection Vulnerability Vulnerability
HIGHCVE-2021-21289 is a HIGH (CVSS 7.4) command injection vulnerability vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Mechanize libraries in the RubyGems ecosystem. The issue involves command injection vulnerability in mechanize. Remediation is available by upgrading affected packages to version 2.7.7.
CVE-2021-21289 at a Glance
Security Impact
CVSS: 7.4
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:R/S:C/C:N/I:H/A:N).
How to Fix CVE-2021-21289
To remediate this vulnerability, upgrade all affected Mechanize 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 mechanize to 2.7.7Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for mechanizeHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-21289, inspect your project dependencies for Mechanize:
inspect dependencies for mechanizeAnalyze the terminal output to locate any version of Mechanize in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.7.7), 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Mechanize, 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-2021-21289 Affected Mechanize Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
mechanize
|
RubyGems |
≥ 2.0.0
< 2.7.7
|
2.7.7
|
References
Frequently Asked Questions
What is CVE-2021-21289?
Which Mechanize versions are affected?
What version fixes CVE-2021-21289?
Is mechanize affected?
What is the CVSS score of CVE-2021-21289?
What CWE is associated with CVE-2021-21289?
How can I check RubyGems dependencies for CVE-2021-21289?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-qrqm-fpv6-6r8g",
"modified" : "2022-04-27T20:24:21Z",
"published" : "2021-02-02T18:50:27Z",
"aliases" : [ "CVE-2021-21289" ],
"summary" : "Command Injection Vulnerability in Mechanize",
"details" : "This security advisory has been created for public disclosure of a Command Injection vulnerability that was responsibly reported by @kyoshidajp (Katsuhiko YOSHIDA).\n\n### Impact\n\nMechanize `>= v2.0`, `< v2.7.7` allows for OS commands to be injected using several classes' methods which implicitly use Ruby's `Kernel.open` method. Exploitation is possible only if untrusted input is used as a local filename and passed to any of these calls:\n\n- `Mechanize::CookieJar#load`: since v2.0 (see 208e3ed)\n- `Mechanize::CookieJar#save_as`: since v2.0 (see 5b776a4)\n- `Mechanize#download`: since v2.2 (see dc91667)\n- `Mechanize::Download#save` and `#save!` since v2.1 (see 98b2f51, bd62ff0)\n- `Mechanize::File#save` and `#save_as`: since v2.1 (see 2bf7519)\n- `Mechanize::FileResponse#read_body`: since v2.0 (see 01039f5)\n\n\n### Patches\n\nThese vulnerabilities are patched in Mechanize v2.7.7.\n\n\n### Workarounds\n\nNo workarounds are available. We recommend upgrading to v2.7.7 or later.\n\n\n### References\n\nSee https://docs.rubocop.org/rubocop/cops_security.html#securityopen for background on why `Kernel.open` should not be used with untrusted input.\n\n\n### For more information\n\nIf you have any questions or comments about this advisory, please open an issue in [sparklemotion/mechanize](https://github.com/sparklemotion/mechanize/issues/new).",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "RubyGems",
"name" : "mechanize"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.0.0"
}, {
"fixed" : "2.7.7"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/sparklemotion/mechanize/security/advisories/GHSA-qrqm-fpv6-6r8g"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21289"
}, {
"type" : "WEB",
"url" : "https://github.com/sparklemotion/mechanize/commit/66a6a1bfa653a5f13274a396a5e5441238656aa0"
}, {
"type" : "WEB",
"url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/mechanize/CVE-2021-21289.yml"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/sparklemotion/mechanize"
}, {
"type" : "WEB",
"url" : "https://github.com/sparklemotion/mechanize/releases/tag/v2.7.7"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2021/02/msg00021.html"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LBVVJUL4P4KCJH4IQTHFZ4ATXY7XXZPV"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YNFZ7ROYS6V4J5L5PRAJUG2AWC7VXR2V"
}, {
"type" : "WEB",
"url" : "https://rubygems.org/gems/mechanize"
}, {
"type" : "WEB",
"url" : "https://security.gentoo.org/glsa/202107-17"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-78" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-02-02T18:50:15Z",
"nvd_published_at" : "2021-02-02T19:15:00Z"
}
}