Description (CNA)
Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| The Libreswan Project / libreswan | affected 0 through 5.3; unaffected 5.3.1 |
CWE
CWE-347, CWE-617
References
- https://libreswan.org/security/CVE-2026-50722/CVE-2026-50722.txt
- https://libreswan.org/security/CVE-2026-50722/
- https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt
- https://www.rfc-editor.org/rfc/rfc8017
ADP enrichment
No English description supplied.
No references supplied.