Arch Linux Security Advisory ASA-201708-13 ========================================== Severity: Low Date : 2017-08-14 CVE-ID : CVE-2017-11185 Package : strongswan Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-382 Summary ======= The package strongswan before version 5.5.3-4 is vulnerable to denial of service. Resolution ========== Upgrade to 5.5.3-4. # pacman -Syu "strongswan>=5.5.3-4" The problem has been fixed upstream but no release is available yet. Workaround ========== None. Description =========== Fixed a DoS vulnerability in the gmp plugin that was caused by insufficient input validation when verifying RSA signatures, which requires decryption with the operation m^e mod n, where m is the signature, and e and n are the exponent and modulus of the public key. The value m is an integer between 0 and n-1, however, the gmp plugin did not verify this. So if m equals n the calculation results in 0, in which case mpz_export() returns NULL. This result wasn't handled properly causing a null-pointer dereference. Impact ====== The attacker is able to crash the application via a specially crafted RSA signature. References ========== https://wiki.strongswan.org/versions/66 https://www.strongswan.org/blog/2017/08/14/strongswan-vulnerability-(cve-201... https://security.archlinux.org/CVE-2017-11185