The icmp_check_sysrq function in net/ipv4/icmp.c in the kernel.org projects/rt patches for the Linux kernel, as used in the kernel-rt package before 3.10.0-327.22.1 in Red Hat Enterprise Linux for Real Time 7 and other products, allows remote attackers to execute SysRq commands via crafted ICMP Echo Request packets, as demonstrated by a brute-force attack to discover a cookie, or an attack that occurs after reading the local icmp_echo_sysrq file.
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Linux_kernel-rt | Linux | * | 3.10.0 (including) |
| Enterprise_linux_for_real_time | Redhat | 7 (including) | 7 (including) |
| Enterprise_linux_for_real_time_for_nfv | Redhat | 7 (including) | 7 (including) |
| Red Hat Enterprise Linux 7 | RedHat | kernel-rt-0:3.10.0-327.22.2.rt56.230.el7_2 | * |
| Red Hat Enterprise MRG 2 | RedHat | kernel-rt-1:3.10.0-327.rt56.190.el6rt | * |
| Linux | Ubuntu | trusty | * |
| Linux-aws | Ubuntu | trusty | * |
| Linux-azure | Ubuntu | trusty | * |
| Linux-lts-xenial | Ubuntu | trusty | * |
Access control involves the use of several protection mechanisms such as:
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses: