Secret disclosure via unvalidated HTTP method
Published Apr 15, 2021 · Updated Aug 3, 2024
CRLF injection in the dio Dart package before 5.0.0 allows remote attackers to disclose request secrets through a crafted HTTP method. DioMixin passes Options.method toward Dart HttpClient.open/openUrl without rejecting control characters, so embedded CRLF sequences split the request line and inject a new destination and headers. Exploitation requires an application to let remote input control the method string; the resulting request can redirect cookies, session data, or tokens to an attacker-controlled server.
Summary
What happened
CRLF injection in the dio Dart package before 5.0.0 allows remote attackers to disclose request secrets through a crafted HTTP method. DioMixin passes Options.method toward Dart HttpClient.open/openUrl without rejecting control characters, so embedded CRLF sequences split the request line and inject a new destination and headers. Exploitation requires an application to let remote input control the method string; the resulting request can redirect cookies, session data, or tokens to an attacker-controlled server.
The record
- CVE
- CVE-2021-31402
- Published
- Apr 15, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-93
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 15, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- CRLF in dio.request proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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