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Redhat.comRH:CVE-2021-21378

HistoryMar 09, 2021 - 11:54 p.m.

CVE-2021-21378

2021-03-0923:54:58

redhat.com

access.redhat.com

authentication bypass

envoyproxy/envoy

json web token (jwt)

allow_missing

incorrect issuer

confidentiality

integrity

CVSS2

6.4

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS3

8.2

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS

0.001

Percentile

48.4%

JSON

An authentication bypass vulnerability was found in envoyproxy/envoy. When specifying a JSON Web Token (JWT) authentication filter, if allow_missing is also used, this flaw allows an attacker to craft a request with a JWT token with an incorrect issuer bypassing the filter. The highest threat from this vulnerability is to confidentiality and integrity.

References

bugzilla.redhat.com/show_bug.cgi?id=1933681

github.com/envoyproxy/envoy/security/advisories/GHSA-4996-m8hf-hj27

istio.io/latest/news/security/istio-security-2021-001/

nvd.nist.gov/vuln/detail/CVE-2021-21378

www.cve.org/CVERecord?id=CVE-2021-21378

CVSS2

6.4

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS3

8.2

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS

0.001

Percentile

48.4%

JSON

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