CVE-2021-29492 (High) detected in envoy-wasmae02dc6bdd5c5ea61c3869395d81689e34988156, envoy-wasmae02dc6bdd5c5ea61c3869395d81689e34988156

[mend-bolt-for-github]

CVE-2021-29492 - High Severity Vulnerability

Vulnerable Libraries - envoy-wasmae02dc6bdd5c5ea61c3869395d81689e34988156, envoy-wasmae02dc6bdd5c5ea61c3869395d81689e34988156

Vulnerability Details

Envoy is a cloud-native edge/middle/service proxy. Envoy does not decode escaped slash sequences %2F and %5C in HTTP URL paths in versions 1.18.2 and before. A remote attacker may craft a path with escaped slashes, e.g. /something%2F..%2Fadmin, to bypass access control, e.g. a block on /admin. A backend server could then decode slash sequences and normalize path and provide an attacker access beyond the scope provided for by the access control policy. ### Impact Escalation of Privileges when using RBAC or JWT filters with enforcement based on URL path. Users with back end servers that interpret %2F and / and %5C and \ interchangeably are impacted. ### Attack Vector URL paths containing escaped slash characters delivered by untrusted client. Patches in versions 1.18.3, 1.17.3, 1.16.4, 1.15.5 contain new path normalization option to decode escaped slash characters. As a workaround, if back end servers treat %2F and / and %5C and \ interchangeably and a URL path based access control is configured, one may reconfigure the back end server to not treat %2F and / and %5C and \ interchangeably.

Publish Date: 2021-05-28

URL: CVE-2021-29492

CVSS 3 Score Details (9.8)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://bugzilla.redhat.com/show_bug.cgi?id=1951188

Release Date: 2021-03-31

Fix Resolution: v1.15.5, v1.16.4, v1.17.3, v1.18.3

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