SB2018092501 - Debian update for strongswan
Published: September 25, 2018 Updated: November 6, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Improper Authentication (CVE-ID: CVE-2018-16151)
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in RSA implementation based on GMP (verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c) within the gmp plugin that does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. A remote attacker can forge signatures when small public exponents are being used and impersonate the victim.
Successful exploitation of the vulnerability may allow an attacker to take full control over victim's session but requires that only an RSA signature is used for IKEv2 authentication.
2) Improper Authentication (CVE-ID: CVE-2018-16152)
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in the RSA implementation based on GMP within the verify_emsa_pkcs1_signature() function in gmp_rsa_public_key.c in the gmp plugin. The GMP plugin does not reject excess data in the digestAlgorithm.parameters field during PKCS#1 v1.5 signature verification. A remote attacker can forge signatures when small public exponents are being used and impersonate the victim.
Successful exploitation of the vulnerability may allow an attacker to take full control over victim's session but requires that only an RSA signature is used for IKEv2 authentication.
Remediation
Install update from vendor's website.