CVE-2024-34702: Botan has a Denial of Service Due to Excessive Name Constraints
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2024-34702?
CVE-2024-34702 is considered to have a high severity due to the performance impact of quadratic time complexity in name constraints checking.
How do I fix CVE-2024-34702?
To fix CVE-2024-34702, upgrade Botan to version 3.5.0 or later, or 2.19.5 or later.
What versions of Botan are affected by CVE-2024-34702?
Botan versions prior to 3.5.0 and 2.19.5 are affected by CVE-2024-34702.
What does CVE-2024-34702 affect in Botan?
CVE-2024-34702 affects the performance of name constraints checking in X.509 certificates.
What types of attacks could CVE-2024-34702 enable?
CVE-2024-34702 could enable denial of service attacks due to excessive resource consumption during name constraints checking.