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CVE Vulnerabilities

CVE-2018-17963

Integer Overflow or Wraparound

Published: Oct 09, 2018 | Modified: Nov 21, 2024
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
6.5 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2018-17963
CWEhttps://cwe.mitre.org/data/definitions/190.html

qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows attackers to cause a denial of service 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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected Software

Name Vendor Start Version End Version
Qemu Qemu * 3.0.0 (including)
Qemu Qemu 3.1.0-rc0 (including) 3.1.0-rc0 (including)
Qemu Qemu 3.1.0-rc1 (including) 3.1.0-rc1 (including)
Qemu Qemu 3.1.0-rc2 (including) 3.1.0-rc2 (including)
Qemu Qemu 3.1.0-rc3 (including) 3.1.0-rc3 (including)
Red Hat Enterprise Linux 7 RedHat qemu-kvm-ma-10:2.12.0-33.el7 *
Red Hat OpenStack Platform 10.0 (Newton) RedHat qemu-kvm-rhev-10:2.12.0-33.el7 *
Red Hat OpenStack Platform 13.0 (Queens) RedHat qemu-kvm-rhev-10:2.12.0-33.el7 *
Red Hat OpenStack Platform 14.0 (Rocky) RedHat qemu-kvm-rhev-10:2.12.0-33.el7 *
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 RedHat qemu-kvm-rhev-10:2.12.0-33.el7 *
Red Hat Virtualization Engine 4.3 RedHat qemu-kvm-rhev-10:2.12.0-33.el7 *
Qemu Ubuntu bionic *
Qemu Ubuntu cosmic *
Qemu Ubuntu devel *
Qemu Ubuntu disco *
Qemu Ubuntu eoan *
Qemu Ubuntu esm-infra-legacy/trusty *
Qemu Ubuntu esm-infra/bionic *
Qemu Ubuntu esm-infra/focal *
Qemu Ubuntu esm-infra/xenial *
Qemu Ubuntu focal *
Qemu Ubuntu groovy *
Qemu Ubuntu hirsute *
Qemu Ubuntu trusty *
Qemu Ubuntu trusty/esm *
Qemu Ubuntu xenial *
Qemu-kvm Ubuntu precise/esm *

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 [REF-1482].
  • 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

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