CVE: CVE-2021-41282

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diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (i.e., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location.

Threat-Mapped Scoring

Score: 0.0

Priority: Unclassified

EPSS

Score: 0.9188
Percentile: 0.99675

CVSS Scoring

CVSS v3.1 Score: 8.8

Severity: HIGH

Mapped CWE(s)

CWE-74 : Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

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-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:pfsense:pfsense:2.5.2:*:*:*:*:*:*:*

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