CVE-2024-55655: Sigstore Sigstore Has Insufficient Validation Of Vulnerability

LOW
Advisory Identifier: GHSA-hhfg-fwrw-87w7
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CWE-20 CWE-325
Published
Advisory Summary

CVE-2024-55655 is a LOW sigstore has insufficient validation of vulnerability (CWE-20: Improper Input Validation) affecting Sigstore libraries in the PyPI ecosystem. The issue involves sigstore has insufficient validation of integration timestamp during verification. Remediation is available by upgrading affected packages to version 3.6.0.

CVE-2024-55655 at a Glance

CVE Identifier CVE-2024-55655
GHSA Identifier GHSA-hhfg-fwrw-87w7
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-20: Improper Input Validation
Affected Product Sigstore
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2024-55655

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

sigstore fixed: 3.6.0 
pip install sigstore>=3.6.0
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 sigstore

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2024-55655, inspect your installed packages using pip:

pip show sigstore

Analyze the terminal output to locate any version of Sigstore in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.6.0), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Sigstore, 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

### Summary Versions of sigstore-python newer than 2.0.0 but prior to 3.6.0 perform insufficient validation of the "integration time" present in "v2" and "v3" bundles during the verification flow: the "integration time" is verified *if* a source of signed time (such as an inclusion promise) is present, but is otherwise trusted if no source of signed time is present. This does not affect "v1" bundles, as the "v1" bundle format always requires an inclusion promise. ### Details Sigstore uses signed time to support verification of signatures made against short-lived signing keys. ### Impact The impact and severity of this weakness is *low*, as Sigstore contains multiple other enforcing components that prevent an attacker who modifies the integration timestamp within a bundle from impersonating a valid signature. In particular, an attacker who modifies the integration timestamp can induce a Denial of Service, but in no different manner than already possible with bundle access (e.g. modifying the signature itself such that it fails to verify). Separately, an attacker could upload a *new* entry to the transparency service, and substitute their new entry's time. However, this would still be rejected at validation time, as the new entry's (valid) signed time would be outside the validity window of the original signing certificate and would nonetheless render the attacker auditable.

CVE-2024-55655 Affected Sigstore Versions

1 component(s)
Fixed Versions:
3.6.0
Product / Package Ecosystem Affected Versions Fixed Version
sigstore
pypi/sigstore
PyPI
≥ 2.0.0
< 3.6.0
3.6.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hhfg-fwrw-87w7
NVD — CVE-2024-55655 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-55655
Security Fix Commit FIX COMMIT
https://github.com/sigstore/sigstore-python/commit/300b502ae99ebfaace124f1f4e422a6a669369cf
Sigstore Source Repository REPOSITORY
https://github.com/sigstore/sigstore-python
Sigstore Release RELEASE
https://github.com/sigstore/sigstore-python/releases/tag/v3.6.0

Frequently Asked Questions

What is CVE-2024-55655?
CVE-2024-55655 is a security vulnerability in Sigstore involving sigstore has insufficient validation of integration timestamp during verification under CWE-20: Improper Input Validation.
Which Sigstore versions are affected?
Affected versions include releases prior to 3.6.0 across affected packages: sigstore.
What version fixes CVE-2024-55655?
Upgrading to 3.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sigstore affected?
Yes, sigstore is affected in releases prior to 3.6.0. Upgrade your dependency to 3.6.0 or later.
What CWE is associated with CVE-2024-55655?
CVE-2024-55655 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2024-55655?
Run the dependency tree command: 'pip show sigstore'. 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-hhfg-fwrw-87w7",
  "modified" : "2024-12-11T18:42:00Z",
  "published" : "2024-12-11T18:42:00Z",
  "aliases" : [ "CVE-2024-55655" ],
  "summary" : "sigstore has insufficient validation of integration timestamp during verification",
  "details" : "### Summary\n\nVersions of sigstore-python newer than 2.0.0 but prior to 3.6.0 perform insufficient validation of the \"integration time\" present in \"v2\" and \"v3\" bundles during the verification flow: the \"integration time\" is verified *if* a source of signed time (such as an inclusion promise) is present, but is otherwise trusted if no source of signed time is present.\n\nThis does not affect \"v1\" bundles, as the \"v1\" bundle format always requires an inclusion promise.\n\n### Details\n\nSigstore uses signed time to support verification of signatures made against short-lived signing keys. \n\n### Impact\n\nThe impact and severity of this weakness is *low*, as Sigstore contains multiple other enforcing components that prevent an attacker who modifies the integration timestamp within a bundle from impersonating a valid signature. In particular, an attacker who modifies the integration timestamp can induce a Denial of Service, but in no different manner than already possible with bundle access (e.g. modifying the signature itself such that it fails to verify).\n\nSeparately, an attacker could upload a *new* entry to the transparency service, and substitute their new entry's time. However, this would still be rejected at validation time, as the new entry's (valid) signed time would be outside the validity window of the original signing certificate and would nonetheless render the attacker auditable.\n",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "sigstore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "3.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hhfg-fwrw-87w7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-55655"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sigstore/sigstore-python/commit/300b502ae99ebfaace124f1f4e422a6a669369cf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sigstore/sigstore-python"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sigstore/sigstore-python/releases/tag/v3.6.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-325" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-12-11T18:42:00Z",
    "nvd_published_at" : "2024-12-10T23:15:06Z"
  }
}