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CVE-2020-1967— Segmentation fault in SSL_check_chain

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 1.1.1d版本、1.1.1e版本和1.1.1f版本中的‘SSL_check_chain()’函数存在代码问题漏洞。远程攻击者可利用该漏洞导致服务器或客户端应用程序崩溃。

AI Predicted 5.9 Difficulty: Easy EPSS 53.34% · P99

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenSSL OpenSSL Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f) affected
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I. Basic Information for CVE-2020-1967

Vulnerability Information
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Vulnerability Title
Segmentation fault in SSL_check_chain
Source: CVE Program / CVE List V5
Vulnerability Description
Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Openssl OpenSSL 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability 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 1.1.1d版本、1.1.1e版本和1.1.1f版本中的‘SSL_check_chain()’函数存在代码问题漏洞。远程攻击者可利用该漏洞导致服务器或客户端应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f) -

II. Public POCs for CVE-2020-1967

# POC Description Source Link Shenlong Link
1 Proof of concept exploit about OpenSSL signature_algorithms_cert DoS flaw (CVE-2020-1967) https://github.com/irsl/CVE-2020-1967 POC Details
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III. Intelligence Information for CVE-2020-1967

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Vendor Advisories for CVE-2020-1967 (10)

Exploits & Public PoCs for CVE-2020-1967 (1)

Mailing List Discussions for CVE-2020-1967 (10)

Other References for CVE-2020-1967 (10)

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2020-1967

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