Vulnerability-Lookup

CNVD-2020-51795

Vulnerability from cnvd - Published: 2020-09-13

Title

OpenSSL信息泄露漏洞（CNVD-2020-51795）

Description

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL中存在安全漏洞。该漏洞源于DH Pre-master Secret Raccoon。攻击者可利用该漏洞绕过数据访问限制，获取敏感信息。

Severity

中

Patch Name

OpenSSL信息泄露漏洞（CNVD-2020-51795）的补丁

Patch Description

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL 中存在安全漏洞。该漏洞源于DH Pre-master Secret Raccoon。攻击者可利用该漏洞绕过数据访问限制，获取敏感信息。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://www.openssl.org/news/secadv/20200909.txt

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-1968

Impacted products

Name
Openssl Openssl

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-1968",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-1968"
    }
  },
  "description": "OpenSSL\u662fOpenSSL\u56e2\u961f\u7684\u4e00\u4e2a\u5f00\u6e90\u7684\u80fd\u591f\u5b9e\u73b0\u5b89\u5168\u5957\u63a5\u5c42\uff08SSLv2/v3\uff09\u548c\u5b89\u5168\u4f20\u8f93\u5c42\uff08TLSv1\uff09\u534f\u8bae\u7684\u901a\u7528\u52a0\u5bc6\u5e93\u3002\u8be5\u4ea7\u54c1\u652f\u6301\u591a\u79cd\u52a0\u5bc6\u7b97\u6cd5\uff0c\u5305\u62ec\u5bf9\u79f0\u5bc6\u7801\u3001\u54c8\u5e0c\u7b97\u6cd5\u3001\u5b89\u5168\u6563\u5217\u7b97\u6cd5\u7b49\u3002\n\nOpenSSL\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eDH Pre-master Secret Raccoon\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u6570\u636e\u8bbf\u95ee\u9650\u5236\uff0c\u83b7\u53d6\u654f\u611f\u4fe1\u606f\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.openssl.org/news/secadv/20200909.txt",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-51795",
  "openTime": "2020-09-13",
  "patchDescription": "OpenSSL\u662fOpenSSL\u56e2\u961f\u7684\u4e00\u4e2a\u5f00\u6e90\u7684\u80fd\u591f\u5b9e\u73b0\u5b89\u5168\u5957\u63a5\u5c42\uff08SSLv2/v3\uff09\u548c\u5b89\u5168\u4f20\u8f93\u5c42\uff08TLSv1\uff09\u534f\u8bae\u7684\u901a\u7528\u52a0\u5bc6\u5e93\u3002\u8be5\u4ea7\u54c1\u652f\u6301\u591a\u79cd\u52a0\u5bc6\u7b97\u6cd5\uff0c\u5305\u62ec\u5bf9\u79f0\u5bc6\u7801\u3001\u54c8\u5e0c\u7b97\u6cd5\u3001\u5b89\u5168\u6563\u5217\u7b97\u6cd5\u7b49\u3002\r\n\r\nOpenSSL \u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8eDH Pre-master Secret Raccoon\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u6570\u636e\u8bbf\u95ee\u9650\u5236\uff0c\u83b7\u53d6\u654f\u611f\u4fe1\u606f\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "OpenSSL\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2020-51795\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Openssl Openssl"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-1968",
  "serverity": "\u4e2d",
  "submitTime": "2020-09-11",
  "title": "OpenSSL\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2020-51795\uff09"
}

CVE-2020-1968 (GCVE-0-2020-1968)

Vulnerability from cvelistv5 – Published: 2020-09-09 13:50 – Updated: 2026-04-16 14:10

Title

Raccoon attack

Summary

The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent over that TLS connection. The attack can only be exploited if an implementation re-uses a DH secret across multiple TLS connections. Note that this issue only impacts DH ciphersuites and not ECDH ciphersuites. This issue affects OpenSSL 1.0.2 which is out of support and no longer receiving public updates. OpenSSL 1.1.1 is not vulnerable to this issue. Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v).

Severity

3.7 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-16 14:10 UTC

CWE

Protocol flaw
CWE-203 - Observable Discrepancy

Assigner

openssl mitre root

References

10 references

URL	Tags
https://www.openssl.org/news/secadv/20200909.txt
https://usn.ubuntu.com/4504-1/	vendor-advisory
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://www.oracle.com/security-alerts/cpujan2021.html
https://security.netapp.com/advisory/ntap-2020091…
https://www.oracle.com/security-alerts/cpuApr2021.html
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.gentoo.org/glsa/202210-02	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v)

Date Public

2020-09-09 00:00

Credits

Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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              "confidentialityImpact": "LOW",
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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.