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GitHub_MCVELIST:CVE-2020-26290

HistoryDec 28, 2020 - 7:15 p.m.

CVE-2020-26290 Critical security issues in XML encoding in Dex

2020-12-2819:15:17

CWE-347

GitHub_M

www.cve.org

dex openid connect saml mattermost signature bypass vulnerabilities.

CVSS3

9.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

9.8

Confidence

High

EPSS

0.004

Percentile

73.7%

JSON

Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).

CNA Affected

[
  {
    "product": "dex",
    "vendor": "dexidp",
    "versions": [
      {
        "status": "affected",
        "version": "< 2.27.0"
      }
    ]
  }
]

References

github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8

github.com/dexidp/dex/releases/tag/v2.27.0

github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5

github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md

github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md

github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md

github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7

mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/

CVSS3

9.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

9.8

Confidence

High

EPSS

0.004

Percentile

73.7%

JSON

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