CVE-2017-1000253

ما هي

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.

CISA: Linux kernel contains a position-independent executable (PIE) stack buffer corruption vulnerability in load_elf_ binary() that allows a local attacker to escalate privileges.

ما العمل

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

الموعد النهائي للوكالات الفدرالية الأمريكية: 30 سبتمبر 2024

• access.redhat.com/errata/RHSA-2017:2798
• access.redhat.com/errata/RHSA-2017:2795
• access.redhat.com/errata/RHSA-2017:2801
• access.redhat.com/errata/RHSA-2017:2796
• access.redhat.com/errata/RHSA-2017:2799