CVE-2023-6936 (GCVE-0-2023-6936)

Vulnerability from cvelistv5 – Published: 2024-02-20 21:52 – Updated: 2025-03-26 16:28
VLAI
Title
Heap-buffer over-read with WOLFSSL_CALLBACKS
Summary
In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-27 14:22 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
wolfSSL wolfSSL Affected: 0 , ≤ 5.6.5 (release bundle)
guessed Create a notification for this product.
wolfssl wolfssl Affected: 0 , ≤ 5.6.5 (custom)
    cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2023-12-20 00:00
Credits
Lucca Hirschi (Inria, LORIA) Steve Kremer (Inria, LORIA) Max Ammann (Trail of Bits) tlspuffin
Show details on NVD website
To clipboard 

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            {
              "lang": "en",
              "type": "finder",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "Max Ammann (Trail of Bits)"
            },
            {
              "lang": "en",
              "type": "tool",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "tlspuffin"
            }
          ],
          "datePublic": "2023-12-20T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\u003cbr\u003e"
                }
              ],
              "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\n"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2024-02-20T21:52:02.441Z",
            "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
            "shortName": "wolfSSL"
          },
          "references": [
            {
              "tags": [
                "patch"
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              "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003e\u003cspan style=\"background-color: transparent;\"\u003eThe fix for this issue is located in the following GitHub Pull Request: \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/wolfSSL/wolfssl/pull/6949/\"\u003ehttps://github.com/wolfSSL/wolfssl/pull/6949/\u003c/a\u003e\u003c/p\u003e"
                }
              ],
              "value": "The fix for this issue is located in the following GitHub Pull Request:  https://github.com/wolfSSL/wolfssl/pull/6949/ https://github.com/wolfSSL/wolfssl/pull/6949/ \n\n"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": " Heap-buffer over-read with WOLFSSL_CALLBACKS",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cli\u003eDo not build wolfSSL with \u003cb\u003eWOLFSSL_CALLBACKS\u003c/b\u003e defined\u003c/li\u003e"
                }
              ],
              "value": "  *  Do not build wolfSSL with WOLFSSL_CALLBACKS defined\n"
            }
          ],
          "x_generator": {
            "engine": "Vulnogram 0.1.0-dev"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "assignerShortName": "wolfSSL",
        "cveId": "CVE-2023-6936",
        "datePublished": "2024-02-20T21:52:02.441Z",
        "dateReserved": "2023-12-18T22:01:24.437Z",
        "dateUpdated": "2025-03-26T16:28:30.322Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.