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CVE-2024-34703— Botan Vulnerable to Denial of Service Due to Overly Large Elliptic Curve Parameters

Quick assessment

Affected
randombit botan
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Botan是一款使用C++编写的加密算法库。该产品支持AES、DES、SHA-1、RSA、DSA和Diffie-Hellman等多种算法。 Botan存在安全漏洞，该漏洞源于允许使用显式编码来出示 ECDSA X.509 证书，在解析时，会检查参数是否为素数，从而导致计算量过大。

CVSS 7.5 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2024-34703

Vulnerability Information
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Vulnerability Title
Botan Vulnerable to Denial of Service Due to Overly Large Elliptic Curve Parameters
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Botan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Botan是一款使用C++编写的加密算法库。该产品支持AES、DES、SHA-1、RSA、DSA和Diffie-Hellman等多种算法。 Botan存在安全漏洞，该漏洞源于允许使用显式编码来出示 ECDSA X.509 证书，在解析时，会检查参数是否为素数，从而导致计算量过大。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
randombit botan >= 3.0.0-alpha0, < 3.3.0 -

II. Public POCs for CVE-2024-34703

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12560 chars
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III. Intelligence Information for CVE-2024-34703

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Patches & Fixes for CVE-2024-34703 (2)

Vendor Advisories for CVE-2024-34703 (1)

IV. Related Vulnerabilities

Same product: botan
Same vendor: randombit
Same weakness: CWE-405

V. Comments for CVE-2024-34703

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