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CVE-2019-1549— Fork Protection

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
High exploitation probability; assess promptly
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 1.1.1版本至1.1.1c版本中存在安全特征问题漏洞。该漏洞是源于网络系统或产品中缺少身份验证、访问控制、权限管理等安全措施。

AI Predicted 5.0 Difficulty: Theoretical EPSS 6.18% · P93

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2019-1549

Vulnerability Information
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Vulnerability Title
Fork Protection
Source: CVE Program / CVE List V5
Vulnerability Description
OpenSSL 1.1.1 introduced a rewritten random number generator (RNG). This was intended to include protection in the event of a fork() system call in order to ensure that the parent and child processes did not share the same RNG state. However this protection was not being used in the default case. A partial mitigation for this issue is that the output from a high precision timer is mixed into the RNG state so the likelihood of a parent and child process sharing state is significantly reduced. If an application already calls OPENSSL_init_crypto() explicitly using OPENSSL_INIT_ATFORK then this problem does not occur at all. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c).
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 安全特征问题漏洞
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 1.1.1版本至1.1.1c版本中存在安全特征问题漏洞。该漏洞是源于网络系统或产品中缺少身份验证、访问控制、权限管理等安全措施。
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 1.1.1d (Affected 1.1.1-1.1.1c) -

II. Public POCs for CVE-2019-1549

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III. Intelligence Information for CVE-2019-1549

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Vendor Advisories for CVE-2019-1549 (11)

Mailing List Discussions for CVE-2019-1549 (3)

Other References for CVE-2019-1549 (1)

Same Patch Batch · OpenSSL · 2019-09-10 · 3 CVEs total

CVE-2019-1547 ECDSA remote timing attack
CVE-2019-1563 Padding Oracle in PKCS7_dataDecode and CMS_decrypt_set1_pkey

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2019-1549

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