Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
0

CVE-2017-1000253

Disclosure Date: October 05, 2017 •
CVE-2017-1000253 CVSS v3 Base Score: 7.8
Exploited in the Wild
Reported by cwyre-r7
View Source Details
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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, loadelf 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.

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CVSS V3 Severity and Metrics
Base Score:
7.8 High
Impact Score:
5.9
Exploitability Score:
1.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • centos,
  • linux,
  • redhat

Products

  • centos 6.0,
  • centos 6.1,
  • centos 6.2,
  • centos 6.3,
  • centos 6.4,
  • centos 6.5,
  • centos 6.6,
  • centos 6.7,
  • centos 6.8,
  • centos 6.9,
  • centos 7.1406,
  • centos 7.1503,
  • centos 7.1511,
  • centos 7.1611,
  • enterprise linux 6.0,
  • enterprise linux 6.1,
  • enterprise linux 6.2,
  • enterprise linux 6.3,
  • enterprise linux 6.4,
  • enterprise linux 6.5,
  • enterprise linux 6.6,
  • enterprise linux 6.7,
  • enterprise linux 6.8,
  • enterprise linux 6.9,
  • enterprise linux 7.0,
  • enterprise linux 7.1,
  • enterprise linux 7.2,
  • enterprise linux 7.3,
  • linux kernel

Exploited in the Wild

Reported by:
Technical Analysis