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Vulnerability · Published Jul 8, 2024 · Assigned by GitHub_M

CVE-2024-34702Botan has a Denial of Service Due to Excessive Name Constraints

Medium 5.3

In plain English

A medium-severity security flaw in botan from randombit. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.8%top 41.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 3.5.0 and 2.19.5, checking name constraints in X.509 certificates is quadratic in the number of names and name constraints. An attacker who presented a certificate chain which contained a very large number of names in the SubjectAlternativeName, signed by a CA certificate which contained a large number of name constraints, could cause a denial of service. The problem has been addressed in Botan 3.5.0 and a partial backport has also been applied and is included in Botan 2.19.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20botan2.19.5-r0ALPINE-CVE-2024-34702
Alpine:v3.21botan2.19.5-r0ALPINE-CVE-2024-34702
Alpine:v3.21botan33.5.0-r0ALPINE-CVE-2024-34702
Alpine:v3.22botan33.5.0-r0ALPINE-CVE-2024-34702
Alpine:v3.23botan33.5.0-r0ALPINE-CVE-2024-34702
Alpine:v3.24botan33.5.0-r0ALPINE-CVE-2024-34702
Debian:12botan2.19.3+dfsg-1+deb12u1DEBIAN-CVE-2024-34702
Debian:13botan2.19.5+dfsg-1DEBIAN-CVE-2024-34702

Affected products (as reported)

VendorProductVersions
randombit botan < 2.19.5>= 3.0.0, < 3.5.0

Weakness: CWE-405 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References