In Tor before 0.2.5.16 0.2.6 through 0.2.8 before 0.2.8.17 0.2.9 before 0.2.9.14 0.3.0 before 0.3.0.13 and 0.3.1 before 0.3.1.9 an attacker can cause a denial of service (application hang) via crafted PEM input that signifies a public key requiring a password which triggers an attempt by the OpenSSL library to ask the user for the password aka TROVE-2017-011.