CVE-2024-34702 — Botan has a Denial of Service Due to Excessive Name Constraints

Affected: randombit botan

Botan is a C++ cryptography library. X.509 certificates can identify elliptic curves using either an object identifier or using explicit encoding of the parameters. Prior to 3.5.0 and 2.19.5, checking name constraints in X.509 certificates is quadratic in the number of names and name constraints. An attacker who presented a certificate chain which contained a very large number of names in the SubjectAlternativeName, signed by a CA certificate which contained a large number of name constraints, could cause a denial of service. The problem has been addressed in Botan 3.5.0 and a partial backport has also been applied and is included in Botan 2.19.5.

USN-7586-1 — botan vulnerabilities

Affected: Ubuntu:Pro:22.04:LTS: botan, Ubuntu:Pro:24.04:LTS: botan

It was discovered that Botan could have compiler dependent operations induced under certain circumstances. An attacker could possibly use this issue to cause undefined behavior. (CVE-2024-50382, CVE-2024-50383)

Bing Shi discovered that Botan did not limit the size of certain inputs when checking primality and name constraints. An attacker could possibly use this issue to cause a denial of service. (CVE-2024-34702, CVE-2024-34703)

It was discovered that Botan did not correctly handle conflicting name constraints. An attacker could possibly use this issue to bypass authentication. (CVE-2024-39312)

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CVE-2024-34702 — Botan has a Denial of Service Due to Excessive Name Constraints

USN-7586-1 — botan vulnerabilities