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CVE-2021-3449— NULL pointer deref in signature_algorithms processing

EPSS 9.86% · P93
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I. Basic Information for CVE-2021-3449

Vulnerability Information
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Vulnerability Title
NULL pointer deref in signature_algorithms processing
Source: NVD (National Vulnerability Database)
Vulnerability Description
An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
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 1.1.1h-1.1.1j 存在代码问题漏洞，该漏洞导致空指针解引用，导致崩溃和拒绝服务攻击。
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

VendorProductAffected VersionsCPESubscribe
OpenSSLOpenSSL Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j) -

II. Public POCs for CVE-2021-3449

#POC DescriptionSource LinkShenlong Link
1CVE-2021-3449 OpenSSL denial-of-service exploit 👨🏻‍💻https://github.com/terorie/cve-2021-3449POC Details
2CVE-2021-3449 OpenSSL denial-of-service exploit 👨🏻‍💻https://github.com/riptl/cve-2021-3449POC Details
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III. Intelligence Information for CVE-2021-3449

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IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2021-3449

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