In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data in the digestAlgorithm.parameters field during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication. This is a variant of CVE-2006-4790 and CVE-2014-1568.
Weakness
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Strongswan | Strongswan | 4.0.0 (including) | 4.6.4 (including) |
| Strongswan | Strongswan | 5.0.0 (including) | 5.7.0 (excluding) |
| Strongswan | Ubuntu | bionic | * |
| Strongswan | Ubuntu | devel | * |
| Strongswan | Ubuntu | esm-infra-legacy/trusty | * |
| Strongswan | Ubuntu | esm-infra/bionic | * |
| Strongswan | Ubuntu | esm-infra/xenial | * |
| Strongswan | Ubuntu | trusty | * |
| Strongswan | Ubuntu | trusty/esm | * |
| Strongswan | Ubuntu | xenial | * |
Related Attack Patterns
References
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
- https://lists.debian.org/debian-lts-announce/2018/09/msg00032.html
- https://security.gentoo.org/glsa/201811-16
- https://usn.ubuntu.com/3771-1/
- https://www.debian.org/security/2018/dsa-4305
- https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
- https://lists.debian.org/debian-lts-announce/2018/09/msg00032.html
- https://security.gentoo.org/glsa/201811-16
- https://usn.ubuntu.com/3771-1/
- https://www.debian.org/security/2018/dsa-4305
- https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html