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Ubuntu Security Notice USN-6709-1

Ubuntu Security Notice 6709-1 - It was discovered that checking excessively long DH keys or parameters may be very slow. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, resulting in a denial of service. After the fix for CVE-2023-3446 Bernd Edlinger discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, resulting in a denial of service.

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==========================================================================Ubuntu Security Notice USN-6709-1March 21, 2024openssl1.0 vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 18.04 LTS (Available with Ubuntu Pro)Summary:Several security issues were fixed in OpenSSL.Software Description:- openssl1.0: Secure Socket Layer (SSL) cryptographic library and toolsDetails:It was discovered that checking excessively long DH keys or parametersmay be very slow. A remote attacker could possibly use this issue tocause OpenSSL to consume resources, resulting in a denial of service.(CVE-2023-3446)After the fix for CVE-2023-3446 Bernd Edlinger discovered that a largeq parameter value can also trigger an overly long computation duringsome of these checks. A remote attacker could possibly use this issueto cause OpenSSL to consume resources, resulting in a denial ofservice. (CVE-2023-3817)David Benjamin discovered that generating excessively long X9.42 DHkeys or checking excessively long X9.42 DH keys or parameters may bevery slow. A remote attacker could possibly use this issue to causeOpenSSL to consume resources, resulting in a denial of service.(CVE-2023-5678)Bahaa Naamneh discovered that processing a maliciously formattedPKCS12 file may lead OpenSSL to crash leading to a potential Denial ofService attack. (CVE-2024-0727)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 18.04 LTS (Available with Ubuntu Pro):  libssl1.0.0                     1.0.2n-1ubuntu5.13+esm1After a standard system update you need to reboot your computer to makeall the necessary changes.References:  https://ubuntu.com/security/notices/USN-6709-1  CVE-2023-3446, CVE-2023-3817, CVE-2023-5678, CVE-2024-0727

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