CVE-2015-5229

La función calloc en el paquete glibc en Red Hat Enterprise Linux (RHEL) 6.7 y 7.2 no inicializa adecuadamente áreas de memoria, lo que podría permitir a atacantes dependientes de contexto provocar una denegación de servicio (colgado o caída) a través de vectores no especificados.

It was discovered that the calloc implementation in glibc could return memory areas which contain non-zero bytes. This could result in unexpected application behavior such as hangs or crashes.

The glibc packages provide the standard C libraries, POSIX thread libraries, standard math libraries, and the name service cache daemon used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly. A stack-based buffer overflow was found in the way the libresolv library performed dual A/AAAA DNS queries. A remote attacker could create a specially crafted DNS response which could cause libresolv to crash or, potentially, execute code with the permissions of the user running the library. Note: this issue is only exposed when libresolv is called from the nss_dns NSS service module.