CVE-2024-34703

Publication date 30 June 2024

Last updated 23 June 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
botan 25.04 plucky
Not affected
24.10 oracular
Fixed 2.19.3+dfsg-1ubuntu2.1
24.04 LTS noble
Fixed 2.19.3+dfsg-1ubuntu2+esm1
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Fixed 2.19.1+dfsg-2ubuntu1+esm1
20.04 LTS focal
Vulnerable
18.04 LTS bionic
Not affected

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Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H