CVE-2024-34703
Botan Vulnerable to Denial of Service Due to Overly Large Elliptic Curve Parameters
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
Botan es una librería de criptografía C++. Los certificados X.509 pueden identificar curvas elípticas utilizando un identificador de objeto o una codificación explícita de los parámetros. Antes de las versiones 3.3.0 y 2.19.4, un atacante podía presentar un certificado ECDSA X.509 usando codificación explícita donde los parámetros eran muy grandes. La prueba de concepto utilizó un prime de 16 Kbit para este propósito. Al analizar, se comprueba que el parámetro sea primo, lo que provoca un cálculo excesivo. Esto fue parcheado en 2.19.4 y 3.3.0 para permitir que el parámetro principal de la curva elíptica tenga como máximo 521 bits. No hay workarounds disponibles. Tenga en cuenta que la compatibilidad con la codificación explícita de parámetros de curvas elípticas está obsoleta en Botan.
CVSS Scores
SSVC
- Decision:Attend
Timeline
- 2024-05-07 CVE Reserved
- 2024-06-30 CVE Published
- 2024-07-01 EPSS Updated
- 2024-08-02 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-405: Asymmetric Resource Consumption (Amplification)
- CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
References (3)
| URL | Tag | Source |
|---|---|---|
| https://github.com/randombit/botan/commit/08c404b23740babee1f6aa51b54e966029aadee4 | X_refsource_misc | |
| https://github.com/randombit/botan/commit/94e9154c143aa5264da6254a6a1be5bc66ee2b5a | X_refsource_misc | |
| https://github.com/randombit/botan/security/advisories/GHSA-w4g2-7m2h-7xj7 | X_refsource_confirm |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Randombit Search vendor "Randombit" | Botan Search vendor "Randombit" for product "Botan" | 3.3.0 Search vendor "Randombit" for product "Botan" and version "3.3.0" | en |
Affected
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| Randombit Search vendor "Randombit" | Botan Search vendor "Randombit" for product "Botan" | < 2.19.4 Search vendor "Randombit" for product "Botan" and version " < 2.19.4" | en |
Affected
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