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SMTP header injection

Description​

Email injection is a security weakness that allows a malicious attacker to exploit email-related features, such as email contact forms found on websites, in order to send harmful email content to unintended recipients.

Impact​

  • Sending arbitrary email in a wide variety of attacks, such as spam, phishing, spear phishing.

Recommendation​

Completely limit unsecured mail functions. Implement the use of specialized services or secure e-mail libraries. Validate incoming data and the escape of data that is not properly encrypted.

Threat​

Authenticated attacker with access to the web service using the SMTP service from the Internet.

Expected Remediation Time​

⌚ 120 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the src.

Base​

  • Attack vector: N
  • Attack complexity: L
  • Privileges required: L
  • User interaction: N
  • Scope: C
  • Confidentiality: N
  • Integrity: N
  • Availability: L

Temporal​

  • Exploit code maturity: P
  • Remediation level: U
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L/E:P/RL:U/RC:C
  • Score:
    • Base: 5.0
    • Temporal: 4.7
  • Severity:
    • Base: Medium
    • Temporal: Medium

Score 4.0​

Default score using CVSS 4.0 . It may change depending on the context of the src.

Base 4.0​

  • Attack vector: N
  • Attack complexity: L
  • Attack Requirements: N
  • Privileges required: L
  • User interaction: N
  • Confidentiality (VC): N
  • Integrity (VI): N
  • Availability (VA): L
  • Confidentiality (SC): N
  • Integrity (SI): N
  • Availability (SA): N

Threat 4.0​

  • Exploit maturity: P

Result 4.0​

  • Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
  • Score:
    • CVSS-BT: 2.1
  • Severity:
    • CVSS-BT: Low

Compliant code​

Non compliant code​

Requirements​

Fixes​

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