A flaw was found in curl before version 7.51.0 When re-using a connection, curl was doing case insensitive comparisons of user name and password with the existing connections. This means that if an unused connection with proper credentials exists for a protocol that has connection-scoped credentials, an attacker can cause that connection to be reused if s/he knows the case-insensitive version of the correct password.
Se ha descubierto un problema en versiones anteriores a la 7.51.0 de curl. Al reutilizar una conexión, curl realizaba comparaciones no sensibles a mayúsculas del nombre de usuario y la contraseña en las conexiones existentes. Esto significa que, si existe una conexión no utilizada con credenciales adecuadas para un protocolo que tiene credenciales restringidas a la conexión, un atacante podría provocar que se reutilice esa conexión si este conoce la versión que no distingue entre mayúsculas/minúsculas de la contraseña correcta.
It was discovered that curl incorrectly reused client certificates when built with NSS. A remote attacker could possibly use this issue to hijack the authentication of a TLS connection. Nguyen Vu Hoang discovered that curl incorrectly handled escaping certain strings. A remote attacker could possibly use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.
