github - ghsa-j8cm-g7r6-hfpq

GHSA-J8CM-G7R6-HFPQ

Vulnerability from github – Published: 2024-07-17 18:30 – Updated: 2024-11-18 16:26

Summary

vodozemac's usage of non-constant time base64 decoder could lead to leakage of secret key material

Details

Versions before 0.7.0 of vodozemac use a non-constant time base64 implementation for importing key material for Megolm group sessions and PkDecryption Ed25519 secret keys. This flaw might allow an attacker to infer some information about the secret key material through a side-channel attack.

Impact

The use of a non-constant time base64 implementation might allow an attacker to observe timing variations in the encoding and decoding operations of the secret key material. This could potentially provide insights into the underlying secret key material.

The impact of this vulnerability is considered low because exploiting the attacker is required to have access to high precision timing measurements, as well as repeated access to the base64 encoding or decoding processes. Additionally, the estimated leakage amount is bounded and low according to the referenced paper.

Patches

The patch is in commit 734b6c6948d4b2bdee3dd8b4efa591d93a61d272.

Workarounds

None.

References

A detailed description of the precise attack can be found at https://arxiv.org/abs/2108.04600. We kindly thank Soatok for pointing out this research to us.

For more information

If you have any questions or comments about this advisory please email us at security at matrix.org.

Severity ?

3.7 (Low)


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

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "vodozemac"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-40640"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-208"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-07-17T18:30:55Z",
    "nvd_published_at": "2024-07-17T18:15:04Z",
    "severity": "MODERATE"
  },
  "details": "Versions before 0.7.0 of vodozemac use a non-constant time base64 implementation for importing key material for Megolm group sessions and `PkDecryption` Ed25519 secret keys. This flaw might allow an attacker to infer some information about the secret key material through a side-channel attack.\n\n### Impact\n\nThe use of a non-constant time base64 implementation might allow an attacker to observe timing variations in the encoding and decoding operations of the secret key material. This could potentially provide insights into the underlying secret key material.\n\nThe impact of this vulnerability is considered low because exploiting the attacker is required to have access to high precision timing measurements, as well as repeated access to the base64 encoding or decoding processes.  Additionally, the estimated leakage amount is bounded and low according to the referenced paper.\n\n### Patches\n\nThe patch is in commit 734b6c6948d4b2bdee3dd8b4efa591d93a61d272.\n\n### Workarounds\nNone.\n\n### References\nA detailed description of the precise attack can be found at https://arxiv.org/abs/2108.04600. We kindly thank Soatok for pointing out this research to us.\n\n### For more information\nIf you have any questions or comments about this advisory please email us at [security at matrix.org](mailto:security@matrix.org).\n",
  "id": "GHSA-j8cm-g7r6-hfpq",
  "modified": "2024-11-18T16:26:53Z",
  "published": "2024-07-17T18:30:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/vodozemac/security/advisories/GHSA-j8cm-g7r6-hfpq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40640"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/vodozemac/commit/734b6c6948d4b2bdee3dd8b4efa591d93a61d272"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/vodozemac/commit/77765dace11266ef9523301624a01265c6e0f790"
    },
    {
      "type": "WEB",
      "url": "https://arxiv.org/abs/2108.04600"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/vodozemac"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2024-0354.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "vodozemac\u0027s usage of non-constant time base64 decoder could lead to leakage of secret key material"
}

CVE-2024-40640 (GCVE-0-2024-40640)

Vulnerability from cvelistv5 – Published: 2024-07-17 17:27 – Updated: 2024-08-02 04:33

Summary

vodozemac is an open source implementation of Olm and Megolm in pure Rust. Versions before 0.7.0 of vodozemac use a non-constant time base64 implementation for importing key material for Megolm group sessions and `PkDecryption` Ed25519 secret keys. This flaw might allow an attacker to infer some information about the secret key material through a side-channel attack. The use of a non-constant time base64 implementation might allow an attacker to observe timing variations in the encoding and decoding operations of the secret key material. This could potentially provide insights into the underlying secret key material. The impact of this vulnerability is considered low because exploiting the attacker is required to have access to high precision timing measurements, as well as repeated access to the base64 encoding or decoding processes. Additionally, the estimated leakage amount is bounded and low according to the referenced paper. This has been patched in commit 734b6c6948d4b2bdee3dd8b4efa591d93a61d272 which has been included in release version 0.7.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Severity ?

2.9 (Low)


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

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

GitHub_M

References

URL

Tags

	https://github.com/matrix-org/vodozemac/security/…	x_refsource_CONFIRM
	https://github.com/matrix-org/vodozemac/commit/73…	x_refsource_MISC
	https://arxiv.org/abs/2108.04600	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	matrix-org	vodozemac	Affected: < 0.7.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2024-40640",
                "options": [
                  {
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-07-17T18:15:24.360907Z",
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    "cna": {
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      "metrics": [
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            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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      },
      "title": "Usage of non-constant time base64 decoder could lead to leakage of secret key material in vodozemac"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2024-07-17T17:27:15.586Z",
    "dateReserved": "2024-07-08T16:13:15.512Z",
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-J8CM-G7R6-HFPQ

Impact

Patches

Workarounds

References

For more information

CVE-2024-40640 (GCVE-0-2024-40640)

Tags

Sightings

Nomenclature