Vulnerability CVE-2017-1000253


Published: 2017-10-04   Modified: 2017-10-05

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.

See advisories in our WLB2 database:
Topic
Author
Date
High
Linux CentOS 7 before 1708 PIE/stack corruption
Qualys
04.10.2017

Type:

CWE-119

(Improper Restriction of Operations within the Bounds of a Memory Buffer)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Redhat -> Enterprise linux 
Centos -> Centos 

 References:
http://www.securityfocus.com/bid/101010
http://www.securitytracker.com/id/1039434
https://access.redhat.com/errata/RHSA-2017:2793
https://access.redhat.com/errata/RHSA-2017:2794
https://access.redhat.com/errata/RHSA-2017:2795
https://access.redhat.com/errata/RHSA-2017:2796
https://access.redhat.com/errata/RHSA-2017:2797
https://access.redhat.com/errata/RHSA-2017:2798
https://access.redhat.com/errata/RHSA-2017:2799
https://access.redhat.com/errata/RHSA-2017:2800
https://access.redhat.com/errata/RHSA-2017:2801
https://access.redhat.com/errata/RHSA-2017:2802
https://www.qualys.com/2017/09/26/cve-2017-1000253/cve-2017-1000253.txt

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