CVE-2021-23841— 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 public API 存在代码问题漏洞，该漏洞源于 X509_issuer_and_serial_hash 函数不能正确处理解析 issuer 字段时可能发生的任何错误。
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service
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一、 漏洞 CVE-2021-23841 基础信息
漏洞信息
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Vulnerability Title
Null pointer deref in X509_issuer_and_serial_hash()
来源: CVE Program / CVE List V5
Vulnerability Description
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
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 public API 存在代码问题漏洞，该漏洞源于 X509_issuer_and_serial_hash 函数不能正确处理解析 issuer 字段时可能发生的任何错误。
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-2021-23841 的公开POC
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CVE-2021-23841 厂商安全公告 (14)
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https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
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https://support.apple.com/kb/HT212534 x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
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https://www.openssl.org/news/secadv/20210216.txt x_refsource_CONFIRM
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https://security.netapp.com/advisory/ntap-20210513-0002/ x_refsource_CONFIRM
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https://security.netapp.com/advisory/ntap-20210219-0009/ x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
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https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
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https://support.apple.com/kb/HT212529 x_refsource_CONFIRM
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CVE-2021-23841 邮件列表归档 (3)
CVE-2021-23841 其他参考 (4)
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https://www.tenable.com/security/tns-2021-03 x_refsource_CONFIRM
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https://www.tenable.com/security/tns-2021-09 x_refsource_CONFIRM
同批安全公告 · OpenSSL · 2021-02-16 · 共 3 条
| CVE-2021-23839 | OpenSSL 加密问题漏洞 | |
| CVE-2021-23840 | OpenSSL 输入验证错误漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2021-23841
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