CVE-2021-29652: Github.com/pomerium/pomerium Pomerium_signature Is Not Verified Vulnerability

MODERATE
Advisory Identifier: GHSA-fv82-r8qv-ch4v
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CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2021-29652 is a MODERATE (CVSS 6.1) pomerium_signature is not verified vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Github.com/pomerium/pomerium libraries in the Go ecosystem. The issue involves pomerium_signature is not verified in middleware in github.com/pomerium/pomerium. Remediation is available by upgrading affected packages to version 0.13.4.

CVE-2021-29652 at a Glance

CVE Identifier CVE-2021-29652
GHSA Identifier GHSA-fv82-r8qv-ch4v
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Github.com/pomerium/pomerium
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.1

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

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

How to Fix CVE-2021-29652

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

github.com/pomerium/pomerium fixed: 0.13.4 
Upgrade github.com/pomerium/pomerium to 0.13.4
Verify Direct and Transitive Dependencies

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

inspect dependencies for github.com/pomerium/pomerium

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-29652, inspect your project dependencies for Github.com/pomerium/pomerium:

inspect dependencies for github.com/pomerium/pomerium

Analyze the terminal output to locate any version of Github.com/pomerium/pomerium in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.13.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Github.com/pomerium/pomerium, 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

### Impact Some API endpoints under /.pomerium/ do not verify parameters with pomerium_signature. This could allow modifying parameters intended to be trusted to Pomerium. The issue mainly affects routes responsible for sign in/out, but does not introduce an authentication bypass. ### Specific Go Packages Affected github.com/pomerium/pomerium/authenticate ### Patches Patched in v0.13.4 ### For more information If you have any questions or comments about this advisory * Open an issue in [pomerium](http://github.com/pomerium/pomerium) * Email us at [security@pomerium.com](mailto:security@pomerium.com)

CVE-2021-29652 Affected Github.com/pomerium/pomerium Versions

1 component(s)
Fixed Versions:
0.13.4
Product / Package Ecosystem Affected Versions Fixed Version
github.com/pomerium/pomerium
golang/github.com/pomerium/pomerium
Go
≥ 0.10.0
< 0.13.4
0.13.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pomerium/pomerium/security/advisories/GHSA-fv82-r8qv-ch4v
NVD — CVE-2021-29652 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29652
Github.com/pomerium/pomerium Source Repository REPOSITORY
https://github.com/pomerium/pomerium/pull/2048

Frequently Asked Questions

What is CVE-2021-29652?
CVE-2021-29652 is a security vulnerability in Github.com/pomerium/pomerium involving pomerium_signature is not verified in middleware in github.com/pomerium/pomerium under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Github.com/pomerium/pomerium versions are affected?
Affected versions include releases prior to 0.13.4 across affected packages: github.com/pomerium/pomerium.
What version fixes CVE-2021-29652?
Upgrading to 0.13.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/pomerium/pomerium affected?
Yes, github.com/pomerium/pomerium is affected in releases prior to 0.13.4. Upgrade your dependency to 0.13.4 or later.
What is the CVSS score of CVE-2021-29652?
CVE-2021-29652 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-29652?
CVE-2021-29652 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Go dependencies for CVE-2021-29652?
Run the dependency tree command: 'inspect dependencies for github.com/pomerium/pomerium'. 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-fv82-r8qv-ch4v",
  "modified" : "2023-10-02T12:10:36Z",
  "published" : "2021-05-21T16:24:22Z",
  "aliases" : [ "CVE-2021-29652" ],
  "summary" : "pomerium_signature is not verified in middleware in github.com/pomerium/pomerium",
  "details" : "### Impact\nSome API endpoints under /.pomerium/ do not verify parameters with pomerium_signature. This could allow modifying parameters intended to be trusted to Pomerium. \n\nThe issue mainly affects routes responsible for sign in/out, but does not introduce an authentication bypass.\n\n### Specific Go Packages Affected\ngithub.com/pomerium/pomerium/authenticate\n\n### Patches\nPatched in v0.13.4\n\n### For more information\nIf you have any questions or comments about this advisory\n* Open an issue in [pomerium](http://github.com/pomerium/pomerium)\n* Email us at [security@pomerium.com](mailto:security@pomerium.com)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/pomerium/pomerium"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.10.0"
      }, {
        "fixed" : "0.13.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pomerium/pomerium/security/advisories/GHSA-fv82-r8qv-ch4v"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-29652"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pomerium/pomerium/pull/2048"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T20:47:18Z",
    "nvd_published_at" : null
  }
}