CVE-2021-3449— OpenSSL 代码问题漏洞
一分钟漏洞结论
影响对象
OpenSSL OpenSSL
利用判断
存在公开或 AI PoC，应优先验证
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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。
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一、 漏洞 CVE-2021-3449 基础信息
漏洞信息
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Vulnerability Title
NULL pointer deref in signature_algorithms processing
来源: CVE Program / CVE List V5
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).
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 代码问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2021-3449 的公开POC
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CVE-2021-3449 厂商安全公告 (15)
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https://security.netapp.com/advisory/ntap-20210513-0002/ x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
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https://www.oracle.com/security-alerts/cpujul2022.html x_refsource_MISC
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https://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf x_refsource_CONFIRM
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https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
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https://security.netapp.com/advisory/ntap-20210326-0006/ x_refsource_CONFIRM
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https://www.openssl.org/news/secadv/20210325.txt x_refsource_CONFIRM
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https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
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https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
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https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd vendor-advisory x_refsource_CISCO
CVE-2021-3449 邮件列表归档 (4)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/ vendor-advisory x_refsource_FEDORA
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CVE-2021-3449 其他参考 (7)
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https://www.tenable.com/security/tns-2021-06 x_refsource_CONFIRM
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https://www.tenable.com/security/tns-2021-10 x_refsource_CONFIRM
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https://kc.mcafee.com/corporate/index?page=content&id=SB10356 x_refsource_CONFIRM
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https://www.tenable.com/security/tns-2021-05 x_refsource_CONFIRM
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https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013 x_refsource_CONFIRM
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https://www.tenable.com/security/tns-2021-09 x_refsource_CONFIRM
IV. Related Vulnerabilities
V. Comments for CVE-2021-3449
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