lodash vulnerable to Code Injection via `_.template` imports key names
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 4.18.1, 4.18.0
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
The fix for CVE-2021-23337 added validation for the variable option in .template but did not apply the same validation to options.imports key names, and both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, .template uses assignInWith to merge imports, which enumerates inherited properties via for..in, so if Object.prototype has been polluted by another vector the polluted keys are copied into the imports object and passed to Function(). The issue is fixed in 4.18.1 for lodash, lodash-es, lodash-amd, and lodash.template. As a workaround, do not pass untrusted input as key names in options.imports; use only developer-controlled, static key names.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- lodash lodash
From 4.0.0 · fixed in 4.18.1
- lodash lodash-es
From 4.0.0 · fixed in 4.18.1
- lodash lodash-amd
From 4.0.0 · fixed in 4.18.1
- lodash lodash.template
From 4.0.0 · fixed in 4.18.1
- lodashnpm
From 4.0.0 · fixed in 4.18.0
- lodash-esnpm
From 4.0.0 · fixed in 4.18.0
- lodash-amdnpm
From 4.0.0 · fixed in 4.18.0
- lodash.templatenpm
From 4.0.0 · fixed in 4.18.0