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ViewState not encrypted

Description​

The state information of application forms that is stored in the ViewState is not encrypted.

Impact​

Leak app state information through the ViewState value.

Recommendation​

Encrypt the ViewState in the application configuration.

Threat​

Anonymous attacker with local access to the victims browser.

Expected Remediation Time​

⌚ 15 minutes.

Score​

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

Base​

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

Temporal​

  • Exploit code madurity: X
  • Remediation level: O
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C
  • Score:
    • Base: 2.9
    • Temporal: 2.8
  • Severity:
    • Base: Low
    • Temporal: Low

Code Examples​

Compliant code​

<configuration xmlns =https://myhost.com>
  <system.web>
    <pages viewStateEncryptionMode="Always"”>
    …
  </system.web>
</configuration>

Non compliant code​

Incorrectly configured viewState Encryption

<configuration xmlns =https://myhost.com>
  <system.web>
    <pages viewStateEncryptionMode=”None”>
    …
  </system.web>
</configuration>

Requirements​

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