Vulnerability-Lookup

RHSA-2021_1538

Vulnerability from csaf_redhat - Published: 2021-05-11 23:31 - Updated: 2024-11-22 16:56

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

Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2021:1538

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

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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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "envoyproxy/envoy: HTTP request with escaped slash characters can bypass Envoy\u0027s authorization mechanisms"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "the Istio Product Security Working Group"
          ]
        }
      ],
      "cve": "CVE-2021-31920",
      "cwe": {
        "id": "CWE-863",
        "name": "Incorrect Authorization"
      },
      "discovery_date": "2021-05-10T00:00:00+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "8Base-OSSM-2.0:servicemesh-proxy-0:2.0.4-1.el8.ppc64le",
            "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"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1959481"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "istio/istio: HTTP request with escaped slash characters can bypass authorization mechanisms",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This CVE addresses the specific fixes required in istio to support the vulnerability found in envoyproxy/envoy, CVE-2021-29492.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-31920"
        },
        {
          "category": "external",
          "summary": "RHBZ#1959481",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1959481"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-31920",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-31920"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-31920",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-31920"
        },
        {
          "category": "external",
          "summary": "https://istio.io/latest/news/security/istio-security-2021-005/",
          "url": "https://istio.io/latest/news/security/istio-security-2021-005/"
        }
      ],
      "release_date": "2021-05-11T19:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-05-11T23:31:38+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "url": "https://access.redhat.com/errata/RHSA-2021:1538"
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
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          ]
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      ],
      "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

References

URL

	Vendor	Product	Version
	envoyproxy	envoy	Affected: <= 1.18.2

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

References

URL

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2021_1538

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

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

Tags

Sightings

Nomenclature