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OpenSSL Client DoS due to large DH parameter (CVE-2018-0732)

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OpenSSL Client DoS due to large DH parameter (CVE-2018-0732)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
06/12/2018
Created
07/25/2018
Added
06/13/2018
Modified
06/20/2019

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).

Solution(s)

  • http-openssl-1_0_2-upgrade-1_0_2_p
  • http-openssl-1_1_0-upgrade-1_1_0_i

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