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CVE-2018-0732— Client DoS due to large DH parameter

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 1.1.0版本至1.1.0h版本和1.0.2版本至1.0.2o版本中存在加密问题漏洞。该漏洞源于网络系统或产品未正确使用相关密码算法，导致内容未正确加密、弱加密、明文存储敏感信息等。

AI Predicted 5.0 Difficulty: Trivial EPSS 48.83% · P99

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenSSL OpenSSL Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h) affected
Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o) affected
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I. Basic Information for CVE-2018-0732

Vulnerability Information
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Vulnerability Title
Client DoS due to large DH parameter
Source: CVE Program / CVE List V5
Vulnerability Description
During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).
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 加密问题漏洞
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 1.1.0版本至1.1.0h版本和1.0.2版本至1.0.2o版本中存在加密问题漏洞。该漏洞源于网络系统或产品未正确使用相关密码算法，导致内容未正确加密、弱加密、明文存储敏感信息等。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h) -

II. Public POCs for CVE-2018-0732

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III. Intelligence Information for CVE-2018-0732

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Vendor Advisories for CVE-2018-0732 (23)

Mailing List Discussions for CVE-2018-0732 (4)

Security Blog Posts for CVE-2018-0732 (1)

Other References for CVE-2018-0732 (7)

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2018-0732

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