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CVE Vulnerabilities

CVE-2023-6478

Integer Overflow or Wraparound

Published: Dec 13, 2023 | Modified: Aug 04, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
7.6 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2023-6478
CWEhttps://cwe.mitre.org/data/definitions/190.html

A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive information.

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
X_server X.org * 21.1.10 (excluding)
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION RedHat tigervnc-0:1.1.0-25.el6_10.13 *
Red Hat Enterprise Linux 7 RedHat tigervnc-0:1.8.0-28.el7_9 *
Red Hat Enterprise Linux 7 RedHat xorg-x11-server-0:1.20.4-25.el7_9 *
Red Hat Enterprise Linux 8 RedHat tigervnc-0:1.13.1-2.el8_9.4 *
Red Hat Enterprise Linux 8 RedHat xorg-x11-server-0:1.20.11-22.el8 *
Red Hat Enterprise Linux 8 RedHat xorg-x11-server-Xwayland-0:21.1.3-15.el8 *
Red Hat Enterprise Linux 8.2 Advanced Update Support RedHat tigervnc-0:1.9.0-15.el8_2.6 *
Red Hat Enterprise Linux 8.2 Telecommunications Update Service RedHat tigervnc-0:1.9.0-15.el8_2.6 *
Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions RedHat tigervnc-0:1.9.0-15.el8_2.6 *
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support RedHat tigervnc-0:1.11.0-8.el8_4.5 *
Red Hat Enterprise Linux 8.4 Telecommunications Update Service RedHat tigervnc-0:1.11.0-8.el8_4.5 *
Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions RedHat tigervnc-0:1.11.0-8.el8_4.5 *
Red Hat Enterprise Linux 8.6 Extended Update Support RedHat tigervnc-0:1.12.0-6.el8_6.6 *
Red Hat Enterprise Linux 8.8 Extended Update Support RedHat tigervnc-0:1.12.0-15.el8_8.4 *
Red Hat Enterprise Linux 9 RedHat tigervnc-0:1.13.1-3.el9_3.3 *
Red Hat Enterprise Linux 9 RedHat xorg-x11-server-0:1.20.11-24.el9 *
Red Hat Enterprise Linux 9 RedHat xorg-x11-server-Xwayland-0:22.1.9-5.el9 *
Red Hat Enterprise Linux 9.0 Extended Update Support RedHat tigervnc-0:1.11.0-22.el9_0.5 *
Red Hat Enterprise Linux 9.2 Extended Update Support RedHat tigervnc-0:1.12.0-14.el9_2.2 *
Xorg Ubuntu bionic *
Xorg Ubuntu trusty *
Xorg Ubuntu xenial *
Xorg-server Ubuntu bionic *
Xorg-server Ubuntu devel *
Xorg-server Ubuntu esm-infra-legacy/trusty *
Xorg-server Ubuntu esm-infra/bionic *
Xorg-server Ubuntu esm-infra/focal *
Xorg-server Ubuntu esm-infra/xenial *
Xorg-server Ubuntu focal *
Xorg-server Ubuntu jammy *
Xorg-server Ubuntu lunar *
Xorg-server Ubuntu mantic *
Xorg-server Ubuntu noble *
Xorg-server Ubuntu oracular *
Xorg-server Ubuntu plucky *
Xorg-server Ubuntu trusty *
Xorg-server Ubuntu trusty/esm *
Xorg-server Ubuntu upstream *
Xorg-server Ubuntu xenial *
Xorg-server-hwe-16.04 Ubuntu xenial *
Xorg-server-hwe-18.04 Ubuntu bionic *
Xorg-server-lts-utopic Ubuntu trusty *
Xorg-server-lts-vivid Ubuntu trusty *
Xorg-server-lts-wily Ubuntu trusty *
Xorg-server-lts-xenial Ubuntu trusty *
Xwayland Ubuntu jammy *
Xwayland Ubuntu lunar *
Xwayland Ubuntu mantic *
Xwayland Ubuntu upstream *

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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