CVE-2020-12690: Keystone Insufficient Session Expiration Vulnerability

HIGH
Advisory Identifier: GHSA-6m8p-x4qw-gh5j
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CVSS 8.8
CWE-613
Published
Advisory Summary

CVE-2020-12690 is a HIGH (CVSS 8.8) insufficient session expiration vulnerability (CWE-613: Insufficient Session Expiration) affecting Keystone libraries in the PyPI ecosystem. The issue involves insufficient session expiration in openstack keystone. Remediation is available by upgrading affected packages to version 15.0.1, 16.0.0.

CVE-2020-12690 at a Glance

CVE Identifier CVE-2020-12690
GHSA Identifier GHSA-6m8p-x4qw-gh5j
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-613: Insufficient Session Expiration
Affected Product Keystone
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-12690

To remediate this vulnerability, upgrade all affected Keystone dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

keystone fixed: 15.0.1 
pip install keystone>=15.0.1
keystone fixed: 16.0.0 
pip install keystone>=16.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show keystone

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-12690, inspect your installed packages using pip:

pip show keystone

Analyze the terminal output to locate any version of Keystone in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 15.0.1), your application is affected.

Note: The pip show keystone command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-613: Insufficient Session Expiration, where according to wasc, "insufficient session expiration is when a web site permits an attacker to reuse old session credentials or session ids for authorization.". In Keystone, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The list of roles provided for an OAuth1 access token is silently ignored. Thus, when an access token is used to request a keystone token, the keystone token contains every role assignment the creator had for the project. This results in the provided keystone token having more role assignments than the creator intended, possibly giving unintended escalated access.

CVE-2020-12690 Affected Keystone Versions

2 component(s)
Fixed Versions:
15.0.116.0.0
Product / Package Ecosystem Affected Versions Fixed Version
keystone
pypi/keystone
PyPI
< 15.0.1
15.0.1
keystone
pypi/keystone
PyPI
≥ 16.0.0.0rc1
< 16.0.0
16.0.0

References

NVD — CVE-2020-12690 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-12690
bugs.launchpad.net/keystone/+bug/18732... WEB
https://bugs.launchpad.net/keystone/+bug/1873290
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-6m8p-x4qw-gh5j
Keystone Source Repository REPOSITORY
https://github.com/openstack/keystone
Keystone Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2020-005.html
Keystone Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2020-54.yaml
lists.apache.org/thread.html/re4ffc5... WEB
https://lists.apache.org/thread.html/re4ffc55cd2f1b55a26e07c83b3c22c3fe4bae6054d000a57fb48d8c2@%3Ccommits.druid.apache.org%3E
usn.ubuntu.com/4480-1 WEB
https://usn.ubuntu.com/4480-1
Keystone Security Information SECURITY
https://www.openwall.com/lists/oss-security/2020/05/06/6
Keystone Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/05/07/3

Frequently Asked Questions

What is CVE-2020-12690?
CVE-2020-12690 is a security vulnerability in Keystone involving Insufficient Session Expiration in OpenStack Keystone under CWE-613: Insufficient Session Expiration.
Which Keystone versions are affected?
Affected versions include releases prior to 15.0.1, 16.0.0 across affected packages: keystone.
What version fixes CVE-2020-12690?
Upgrading to 15.0.1, 16.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keystone affected?
Yes, keystone is affected in releases prior to 15.0.1, 16.0.0. Upgrade your dependency to 15.0.1, 16.0.0 or later.
What is the CVSS score of CVE-2020-12690?
CVE-2020-12690 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-12690?
CVE-2020-12690 is classified under CWE-613: Insufficient Session Expiration (According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization.").
How can I check PyPI dependencies for CVE-2020-12690?
Run the dependency tree command: 'pip show keystone'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6m8p-x4qw-gh5j",
  "modified" : "2024-09-27T18:26:15Z",
  "published" : "2021-06-09T17:34:09Z",
  "aliases" : [ "CVE-2020-12690" ],
  "summary" : "Insufficient Session Expiration in OpenStack Keystone",
  "details" : "An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The list of roles provided for an OAuth1 access token is silently ignored. Thus, when an access token is used to request a keystone token, the keystone token contains every role assignment the creator had for the project. This results in the provided keystone token having more role assignments than the creator intended, possibly giving unintended escalated access.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "keystone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "15.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "keystone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "16.0.0.0rc1"
      }, {
        "fixed" : "16.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-12690"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/keystone/+bug/1873290"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-6m8p-x4qw-gh5j"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/keystone"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2020-54.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/re4ffc55cd2f1b55a26e07c83b3c22c3fe4bae6054d000a57fb48d8c2@%3Ccommits.druid.apache.org%3E"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2020-005.html"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4480-1"
  }, {
    "type" : "WEB",
    "url" : "https://www.openwall.com/lists/oss-security/2020/05/06/6"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/05/07/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-613" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T21:08:40Z",
    "nvd_published_at" : "2020-05-07T00:15:00Z"
  }
}