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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