CVE-2024-34703

Name	CVE-2024-34703
Description	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 versions 3.3.0 and 2.19.4, an attacker could present an ECDSA X.509 certificate using explicit encoding where the parameters are very large. The proof of concept used a 16Kbit prime for this purpose. When parsing, the parameter is checked to be prime, causing excessive computation. This was patched in 2.19.4 and 3.3.0 to allow the prime parameter of the elliptic curve to be at most 521 bits. No known workarounds are available. Note that support for explicit encoding of elliptic curve parameters is deprecated in Botan.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
botan (PTS)	bullseye	2.17.3+dfsg-2	vulnerable
	bookworm	2.19.3+dfsg-1	vulnerable
	sid, trixie	2.19.4+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
botan	source	(unstable)	2.19.4+dfsg-1

Notes

https://github.com/randombit/botan/security/advisories/GHSA-w4g2-7m2h-7xj7
https://github.com/randombit/botan/commit/fbe9ec578a8548958677224d2e60d2c2c838bc9a (3.3.0)
https://github.com/randombit/botan/commit/94e9154c143aa5264da6254a6a1be5bc66ee2b5a (2.19.4)