CVE-2024-34703

Name of the Vulnerable Software and Affected Versions Botan versions prior to 2.19.4 and 3.3.0

Description The issue is related to the parsing of X.509 certificates with explicit encoding of elliptic curve parameters. An attacker can present a certificate with very large parameters, causing excessive computation when the parameter is checked to be prime. This can lead to a denial of service. The proof of concept used a 16Kbit prime for this purpose. Support for explicit encoding of elliptic curve parameters is deprecated in Botan.

Recommendations For versions prior to 2.19.4, update to version 2.19.4 or later to patch the issue. For versions prior to 3.3.0, update to version 3.3.0 or later to patch the issue. As a temporary workaround, consider restricting the use of explicit encoding of elliptic curve parameters until a patch is applied.