CVE Vulnerabilities

CVE-2017-17863

Integer Overflow or Wraparound

Published: Dec 27, 2017 | Modified: Mar 16, 2018
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.2 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
5.2 MODERATE
AV:L/AC:H/Au:N/C:P/I:P/A:C
RedHat/V3
6.2 MODERATE
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Ubuntu
HIGH

kernel/bpf/verifier.c in the Linux kernel 4.9.x through 4.9.71 does not check the relationship between pointer values and the BPF stack, which allows local users to cause a denial of service (integer overflow or invalid memory access) or possibly have unspecified other impact.

Weakness

The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.

Affected Software

Name Vendor Start Version End Version
Linux_kernel Linux 4.9.0 (including) 4.9.71 (including)
Linux-flo Ubuntu esm-apps/xenial *
Linux-flo Ubuntu trusty *
Linux-flo Ubuntu xenial *
Linux-goldfish Ubuntu trusty *
Linux-grouper Ubuntu trusty *
Linux-lts-quantal Ubuntu precise/esm *
Linux-lts-raring Ubuntu precise/esm *
Linux-lts-saucy Ubuntu precise/esm *
Linux-lts-utopic Ubuntu trusty *
Linux-lts-vivid Ubuntu trusty *
Linux-lts-vivid Ubuntu trusty/esm *
Linux-lts-wily Ubuntu trusty *
Linux-maguro Ubuntu trusty *
Linux-mako Ubuntu esm-apps/xenial *
Linux-mako Ubuntu trusty *
Linux-mako Ubuntu xenial *
Linux-manta Ubuntu trusty *

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • Use libraries or frameworks that make it easier to handle numbers without unexpected consequences.
  • Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
  • Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
  • Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
  • Understand the programming language’s underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, “not-a-number” calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
  • Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.

References