Vulnerability-Lookup

RHSA-2021:1538

Vulnerability from csaf_redhat - Published: 2021-05-11 23:31 - Updated: 2026-06-26 18:55

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.4 security update

Severity

Important

Notes

Topic: An update for servicemesh and servicemesh-proxy is now available for OpenShift Service Mesh 2.0. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Red Hat OpenShift Service Mesh is Red Hat's distribution of the Istio service mesh project, tailored for installation into an on-premise OpenShift Container Platform installation. Security Fix(es): * envoyproxy/envoy: HTTP request with escaped slash characters can bypass Envoy's authorization mechanisms (CVE-2021-29492) * istio/istio: HTTP request with escaped slash characters can bypass authorization mechanisms (CVE-2021-31920) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2021-29492

An authorization bypass vulnerability was found in envoyproxy/envoy. An attacker can potentially craft an HTTP request that defines a certain pattern of escaped characters in the URI path (such as %2F, %2f, %5C or %5c), allowing them to bypass the envoy authorization service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

8.3 (High)


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

CWE-863 - Incorrect Authorization

Affected products

Fixed 8 products

Product	Version	Remediation
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.src	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.src	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix

Known not affected 19 products

Product	Identifier	Version	Remediation
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.src		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.x86_64		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-istioctl-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-istioctl-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-istioctl-0:2.0.4-1.el8.x86_64		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixc-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixc-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixc-0:2.0.4-1.el8.x86_64		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixs-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixs-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixs-0:2.0.4-1.el8.x86_64		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-agent-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-agent-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-agent-0:2.0.4-1.el8.x86_64		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-discovery-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-discovery-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-discovery-0:2.0.4-1.el8.x86_64		—

Threats

Impact Important

CVE-2021-31920

An authorization bypass flaw was found in Istio. This flaw allows an attacker to craft an HTTP request that defines a certain pattern of escaped characters in the URI path (such as %2F, %2f, %5C, or %5c), allowing them to bypass the authorization service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

8.1 (High)


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

CWE-863 - Incorrect Authorization

Affected products

Fixed 23 products

Product	Version	Remediation
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.src	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-istioctl-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-istioctl-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-istioctl-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixc-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixc-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixc-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixs-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixs-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-mixs-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.src	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-operator-0:2.0.4-3.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-agent-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-agent-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-agent-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-discovery-0:2.0.4-1.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-discovery-0:2.0.4-1.el8.s390x	—	Vendor Fix fix
Unresolved product id: 8Base-OSSM-2.0:servicemesh-pilot-discovery-0:2.0.4-1.el8.x86_64	—	Vendor Fix fix

Known not affected 4 products

Product	Identifier	Version	Remediation
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.ppc64le		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.s390x		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.src		—
Unresolved product id: 8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.x86_64		—

Threats

Impact Important

References

15 references

URL	Category
https://access.redhat.com/errata/RHSA-2021:1538	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1951188	external
https://bugzilla.redhat.com/show_bug.cgi?id=1959481	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2021-29492	self
https://bugzilla.redhat.com/show_bug.cgi?id=1951188	external
https://www.cve.org/CVERecord?id=CVE-2021-29492	external
https://nvd.nist.gov/vuln/detail/CVE-2021-29492	external
https://istio.io/latest/news/releases/1.9.x/annou…	external
https://access.redhat.com/security/cve/CVE-2021-31920	self
https://bugzilla.redhat.com/show_bug.cgi?id=1959481	external
https://www.cve.org/CVERecord?id=CVE-2021-31920	external
https://nvd.nist.gov/vuln/detail/CVE-2021-31920	external
https://istio.io/latest/news/security/istio-secur…	external

Acknowledgments

the Envoy security team

the Istio Product Security Working Group

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        {
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          "title": "Vulnerability description"
        },
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          "title": "Vulnerability summary"
        },
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          "category": "general",
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          "details": "Important"
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      ],
      "title": "envoyproxy/envoy: HTTP request with escaped slash characters can bypass Envoy\u0027s authorization mechanisms"
    },
    {
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        {
          "names": [
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          "title": "Vulnerability summary"
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          "category": "other",
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          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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            "8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.s390x",
            "8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.src",
            "8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "istio/istio: HTTP request with escaped slash characters can bypass authorization mechanisms"
    }
  ]
}

CVE-2021-29492 (GCVE-0-2021-29492)

Vulnerability from cvelistv5 – Published: 2021-05-28 21:00 – Updated: 2024-08-03 22:11

Title

Bypass of path matching rules using escaped slash characters

Summary

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.

Severity

8.1 (High)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7856 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/envoyproxy/envoy/security/advi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
envoyproxy	envoy	Affected: <= 1.18.2

Show details on NVD website

JSON

To clipboard

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CVE-2021-31920 (GCVE-0-2021-31920)

Vulnerability from cvelistv5 – Published: 2021-05-27 04:03 – Updated: 2024-08-03 23:10

Summary

Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2175 records in the last 180 days details

References

1 reference

URL	Tags
https://istio.io/latest/news/security/istio-secur…	x_refsource_CONFIRM

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2021:1538

CVE-2021-29492 (GCVE-0-2021-29492)

CVE-2021-31920 (GCVE-0-2021-31920)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour