CVE-2017-1000253 PoC — Linux kernel 缓冲区错误漏洞

Title:Linux kernel 缓冲区错误漏洞 (CVE-2017-1000253)
Description:Linux distributions that have not patched their long-term kernels with https://git.kernel.org/linus/a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (committed on April 14, 2015). This kernel vulnerability was fixed in April 2015 by commit a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (backported to Linux 3.10.77 in May 2015), but it was not recognized as a security threat. With CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE enabled, and a normal top-down address allocation strategy, load_elf_binary() will attempt to map a PIE binary into an address range immediately below mm->mmap_base. Unfortunately, load_elf_ binary() does not take account of the need to allocate sufficient space for the entire binary which means that, while the first PT_LOAD segment is mapped below mm->mmap_base, the subsequent PT_LOAD segment(s) end up being mapped above mm->mmap_base into the are that is supposed to be the "gap" between the stack and the binary.

Linux Kernel 3.10.0-514.21.2.el7.x86_64 / 3.10.0-514.26.1.el7.x86_64 (CentOS 7) - SUID Position Independent Executable 'PIE' Local Privilege Escalation

 [4.0K]  /data/pocs/bf298940072a165c1fd513f9849ed440687ee1d0
├── [ 38K]  CVE-2017-1000253
├── [ 16K]  CVE-2017-1000253.c
├── [ 14K]  rootshell
├── [1.2K]  rootshell.c
└── [ 85K]  rootshell.h

0 directories, 5 files