CVE: CVE-2021-41084

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http4s is an open source scala interface for HTTP. In affected versions http4s is vulnerable to response-splitting or request-splitting attacks when untrusted user input is used to create any of the following fields: Header names (`Header.name`å), Header values (`Header.value`), Status reason phrases (`Status.reason`), URI paths (`Uri.Path`), URI authority registered names (`URI.RegName`) (through 0.21). This issue has been resolved in versions 0.21.30, 0.22.5, 0.23.4, and 1.0.0-M27 perform the following. As a matter of practice http4s services and client applications should sanitize any user input in the aforementioned fields before returning a request or response to the backend. The carriage return, newline, and null characters are the most threatening.

Threat-Mapped Scoring

Score: 1.8

Priority: P4 - Informational (Low)

S9 – Sabotage of System/App

EPSS

Score: 0.00738
Percentile: 0.71886

CVSS Scoring

CVSS v3.1 Score: 8.7

Severity: HIGH

Mapped CWE(s)

CWE-74 : Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-918 : Server-Side Request Forgery (SSRF)

All CAPEC(s)

CAPEC-10: Buffer Overflow via Environment Variables
CAPEC-101: Server Side Include (SSI) Injection
CAPEC-105: HTTP Request Splitting
CAPEC-108: Command Line Execution through SQL Injection
CAPEC-120: Double Encoding
CAPEC-13: Subverting Environment Variable Values
CAPEC-135: Format String Injection
CAPEC-14: Client-side Injection-induced Buffer Overflow
CAPEC-24: Filter Failure through Buffer Overflow
CAPEC-250: XML Injection
CAPEC-267: Leverage Alternate Encoding
CAPEC-273: HTTP Response Smuggling
CAPEC-28: Fuzzing
CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters
CAPEC-34: HTTP Response Splitting
CAPEC-42: MIME Conversion
CAPEC-43: Exploiting Multiple Input Interpretation Layers
CAPEC-45: Buffer Overflow via Symbolic Links
CAPEC-46: Overflow Variables and Tags
CAPEC-47: Buffer Overflow via Parameter Expansion
CAPEC-51: Poison Web Service Registry
CAPEC-52: Embedding NULL Bytes
CAPEC-53: Postfix, Null Terminate, and Backslash
CAPEC-6: Argument Injection
CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic
CAPEC-664: Server Side Request Forgery
CAPEC-67: String Format Overflow in syslog()
CAPEC-7: Blind SQL Injection
CAPEC-71: Using Unicode Encoding to Bypass Validation Logic
CAPEC-72: URL Encoding
CAPEC-76: Manipulating Web Input to File System Calls
CAPEC-78: Using Escaped Slashes in Alternate Encoding
CAPEC-79: Using Slashes in Alternate Encoding
CAPEC-8: Buffer Overflow in an API Call
CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic
CAPEC-83: XPath Injection
CAPEC-84: XQuery Injection
CAPEC-9: Buffer Overflow in Local Command-Line Utilities

CAPEC(s) with Mapped TTPs

CAPEC-13: Subverting Environment Variable Values
Mapped TTPs:
- T1562.003 : Impair Command History Logging
- T1574.006 : Dynamic Linker Hijacking
- T1574.007 : Path Interception by PATH Environment Variable
CAPEC-267: Leverage Alternate Encoding
Mapped TTPs:
- T1027 : Obfuscated Files or Information

Mapped ATT&CK TTPs

T1562.003 : Impair Command History Logging
Kill Chain: defense-evasion
T1574.006 : Dynamic Linker Hijacking
Kill Chain: persistence
T1574.007 : Path Interception by PATH Environment Variable
Kill Chain: persistence
T1027 : Obfuscated Files or Information
Kill Chain: defense-evasion

Malware

APTs Threat Group Associations

Campaigns

ArcaneDoor
2016 Ukraine Electric Power Attack
C0015
C0017

Affected Products

cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone1:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone10:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone11:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone12:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone13:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone14:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone15:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone16:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone17:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone18:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone19:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone2:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone20:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone21:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone22:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone23:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone24:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone25:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone26:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone3:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone4:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone5:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone6:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone7:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone8:*:*:*:*:*:*
cpe:2.3:a:typelevel:http4s:1.0.0:milestone9:*:*:*:*:*:*

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