Vulnerability-Lookup

ubuntu-cve-2024-13939

Vulnerability from osv_ubuntu

Published

2025-03-28 03:15

Modified

2026-05-20 15:07

Summary

Details

String::Compare::ConstantTime for Perl through 0.321 is vulnerable to timing attacks that allow an attacker to guess the length of a secret string. As stated in the documentation: "If the lengths of the strings are different, because equals returns false right away the size of the secret string may be leaked (but not its contents)." This is similar to CVE-2020-36829

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2024-13939	REPORT
	https://www.cve.org/CVERecord?id=CVE-2024-13939	REPORT
	https://metacpan.org/release/FRACTAL/String-Compa…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.311-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.311-1build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.310-1",
        "0.311-1",
        "0.311-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.312-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.312-1build1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
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          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "0.312-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.321-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.321-1build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.321-1",
        "0.321-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.321-1build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.321-1build3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.321-1build2",
        "0.321-1build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.321-2build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.321-2build4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.321-2build1",
        "0.321-2build2",
        "0.321-2build3",
        "0.321-2build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.321-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.321-3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.321-2build5",
        "0.321-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libstring-compare-constanttime-perl",
            "binary_version": "0.321-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libstring-compare-constanttime-perl",
        "purl": "pkg:deb/ubuntu/libstring-compare-constanttime-perl@0.321-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.321-3"
      ]
    }
  ],
  "aliases": [],
  "details": "String::Compare::ConstantTime for Perl through 0.321 is vulnerable to timing attacks that allow an attacker to guess the length of a secret string. As stated in the documentation: \"If the lengths of the strings are different, because equals returns false right away the size of the secret string may be leaked (but not its contents).\" This is similar to\u00a0CVE-2020-36829",
  "id": "UBUNTU-CVE-2024-13939",
  "modified": "2026-05-20T15:07:31Z",
  "published": "2025-03-28T03:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-13939"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-13939"
    },
    {
      "type": "REPORT",
      "url": "https://metacpan.org/release/FRACTAL/String-Compare-ConstantTime-0.321/view/lib/String/Compare/ConstantTime.pm#TIMING-SIDE-CHANNEL"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2024-13939"
  ]
}

CVE-2024-13939 (GCVE-0-2024-13939)

Vulnerability from cvelistv5 – Published: 2025-03-28 02:05 – Updated: 2025-03-28 14:08

Title

String::Compare::ConstantTime for Perl through 0.321 is vulnerable to timing attacks that allow an attacker to guess the length of a secret string

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-03-28 14:08 UTC

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

CPANSec redhat root

References

1 reference

URL	Tags
https://metacpan.org/release/FRACTAL/String-Compa…	related

Impacted products

1 product

Vendor	Product	Version
FRACTAL	String::Compare::ConstantTime	Affected: 0 , ≤ 0.321 (custom)

Credits

Robert Rothenberg

Show details on NVD website

JSON

To clipboard

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              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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                "timestamp": "2025-03-28T14:08:00.787015Z",
                "version": "2.0.3"
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          "defaultStatus": "unaffected",
          "packageName": "String-Compare-ConstantTime",
          "product": "String::Compare::ConstantTime",
          "programFiles": [
            "ConstantTime.xs"
          ],
          "programRoutines": [
            {
              "name": "equals()"
            }
          ],
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          "vendor": "FRACTAL",
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    "datePublished": "2025-03-28T02:05:01.416Z",
    "dateReserved": "2025-03-26T14:18:41.024Z",
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    "state": "PUBLISHED"
  },
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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.