Botan has a Denial of Service Due to Excessive Name Constraints
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| randombit | botan | before 2.19.5; 3.0.0 to before 3.5.0 | 2.19.5, 3.5.0 | Patch available | CNA |
- botan Vendorrandombit Affected before 2.19.5; 3.0.0 to before 3.5.0 Fixed in 2.19.5, 3.5.0 Patch available CNA
CPE names CISA-ADP · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:randombit:botan:*:*:*:*:*:*:*:* | — | — | — |
- cpe:2.3:a:randombit:botan:*:*:*:*:*:*:*:* Versions — — ·—
Remediation
- Fix · CNA botan (randombit) Fixed in 2.19.5, 3.5.0
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2024-34702
References
Other 13
- https://github.com/randombit/botan/security/advisories/GHSA-5gg9-hqpr-r58j
- https://github.com/randombit/botan/pull/4034
- https://github.com/randombit/botan/pull/4045
- https://github.com/randombit/botan/pull/4047
- https://github.com/randombit/botan/pull/4052
- https://github.com/randombit/botan/pull/4186
- https://github.com/randombit/botan/pull/4187
- https://github.com/randombit/botan/commit/21dccc8fef18c165ba3301d850ac61521f85637e
- https://github.com/randombit/botan/commit/39535f13c322f56aa3da2f44b2b6abb8619a82ac
- https://github.com/randombit/botan/commit/477822a2d10f02d8ba46c9d8a5132f25843f5cc1
- https://github.com/randombit/botan/commit/7606d70d3a2ac7114476ec2651ca0243c4536fdf
- https://github.com/randombit/botan/commit/c3264821b9f6286ee4e6e3e06826f6b7177e6d41
- https://github.com/randombit/botan/commit/ff704b12e6fa351aaedd07bffdc91722e84586b8
More randombit vulnerabilities
- TI-2024-33818 Botan before 3.6.0, when certain GCC versions are used, has a compiler-induced… CVSS 3.1MEDIUM 5.9
- TI-2024-33817 Botan before 3.6.0, when certain LLVM versions are used, has compiler-induced… CVSS 3.1MEDIUM 5.9
- TI-2016-02004 Integer overflow in the PointGFp constructor in Botan before 1.10.11 and 1.11.x before… CVSS 3.0CRITICAL 9.8
- TI-2016-02005 Heap-based buffer overflow in the P-521 reduction function in Botan 1.11.x before 1.11.27… CVSS 3.0CRITICAL 9.8
- TI-2026-26828 Botan has a certificate authentication bypass due to trust anchor confusion CVSS 4.0CRITICAL 9.3
- TI-2016-07479 In Botan 1.8.0 through 1.11.33, when decoding BER data an integer overflow could occur… CVSS 3.0CRITICAL 9.8
Sources
- CVE-2024-34702 · CVE Program
- CVE-2024-34702 · NVD
- FIRST EPSS
- CVE-2024-34702 · Red Hat security data · CC BY 4.0
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