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OVAL Definitions
>
OVAL Definition Details
Id
oval:com.altx-soft.nix:def:18626
[Rus]
Version
5
Class
patch
ALTXid
172817
Language
English
Severity
High
Title
RHSA-2017:2801 -- kernel security update
Description
A flaw was found in the way the Linux kernel loaded ELF executables. Provided that an application was built as Position Independent Executable (PIE), the loader could allow part of that application's data segment to map over the memory area reserved for its stack, potentially resulting in memory corruption. An unprivileged local user with access to SUID (or otherwise privileged) PIE binary could use this flaw to escalate their privileges on the system. (CVE-2017-1000253, Important)
Family
unix
Platform
Red Hat Enterprise Linux 5
Product
kernel
Reference
VENDOR: RHSA-2017:2801
VENDOR: RHSA-2017:2801
Id:
RHSA-2017:2801
Reference:
https://access.redhat.com/errata/RHSA-2017:2801
CVE: CVE-2017-1000253
CVE: CVE-2017-1000253
Id:
CVE-2017-1000253
Reference:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1000253
Comment
: 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.
CVSSv2 Score:
7.2
Access vector:
LOCAL
Access complexity:
LOW
Authentication:
NONE
Confidentiality impact:
COMPLETE
Integrity impact:
COMPLETE
Availability impact:
COMPLETE
CVSSv2 Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C
CWE:
119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)
References:
101010 (BID)
1039434 (SECTRACK)
RHSA-2017:2793 (REDHAT)
RHSA-2017:2794 (REDHAT)
RHSA-2017:2795 (REDHAT)
RHSA-2017:2796 (REDHAT)
RHSA-2017:2797 (REDHAT)
RHSA-2017:2798 (REDHAT)
RHSA-2017:2799 (REDHAT)
RHSA-2017:2800 (REDHAT)
RHSA-2017:2801 (REDHAT)
RHSA-2017:2802 (REDHAT)
https://www.qualys.com/2017/09/26/cve-2017-1000253/cve-2017-1000253.txt (MISC)
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