csaf_microsoft - msrc

MSRC_CVE-2023-6237

Vulnerability from csaf_microsoft - Published: 2024-04-02 07:00 - Updated: 2024-11-28 00:00

Summary

Excessive time spent checking invalid RSA public keys

Notes

Additional Resources

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer

The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

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          "summary": "CVE-2023-6237 Excessive time spent checking invalid RSA public keys - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2023-6237.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-04-25T00:00:00.000Z",
          "details": "3.3.0-1:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
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          "date": "2024-04-25T00:00:00.000Z",
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            "17084-2"
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            "17084-12"
          ],
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalsScore": 0.0,
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 5.9,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
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            "17084-12",
            "17084-11",
            "17084-7",
            "17084-2",
            "17086-1"
          ]
        }
      ],
      "title": "Excessive time spent checking invalid RSA public keys"
    }
  ]
}

CVE-2023-6237 (GCVE-0-2023-6237)

Vulnerability from cvelistv5 – Published: 2024-04-25 06:27 – Updated: 2024-11-01 14:28

Summary

Issue summary: Checking excessively long invalid RSA public keys may take a long time. Impact summary: Applications that use the function EVP_PKEY_public_check() to check RSA public keys may experience long delays. Where the key that is being checked has been obtained from an untrusted source this may lead to a Denial of Service. When function EVP_PKEY_public_check() is called on RSA public keys, a computation is done to confirm that the RSA modulus, n, is composite. For valid RSA keys, n is a product of two or more large primes and this computation completes quickly. However, if n is an overly large prime, then this computation would take a long time. An application that calls EVP_PKEY_public_check() and supplies an RSA key obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function EVP_PKEY_public_check() is not called from other OpenSSL functions however it is called from the OpenSSL pkey command line application. For that reason that application is also vulnerable if used with the '-pubin' and '-check' options on untrusted data. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.

Severity ?

No CVSS data available.

CWE

CWE-606 - Unchecked Input for Loop Condition

Assigner

openssl

References

URL

Tags

	https://www.openssl.org/news/secadv/20240115.txt	vendor-advisory
	https://github.com/openssl/openssl/commit/18c0249…	patch
	https://github.com/openssl/openssl/commit/a830f55…	patch
	https://github.com/openssl/openssl/commit/0b0f7ab…	patch

Impacted products

	Vendor	Product	Version
	OpenSSL	OpenSSL	Affected: 3.0.0 , < 3.0.13 (semver) Affected: 3.1.0 , < 3.1.5 (semver) Affected: 3.2.0 , < 3.2.1 (semver)

Credits

OSS-Fuzz Tomas Mraz

Show details on NVD website

JSON

To clipboard

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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

MSRC_CVE-2023-6237

CVE-2023-6237 (GCVE-0-2023-6237)

Tags

Sightings

Nomenclature