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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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Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application c...

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Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application c...

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Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. One of those checks confirms that the modulus ('p' parameter) is not too large. Trying to use a very large modulus is slow and OpenSSL will not normally use a modulus which is over 10,000 bits in length. However the DH_check() function checks numerous aspects of the key or parameters that have been supplied. Some of those checks use the supplied modulus value even if it has already been found to be too large. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulernable to a Denial ...

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