Vulnerabilities > CVE-2020-14310 - Integer Overflow or Wraparound vulnerability in multiple products

047910
CVSS 6.0 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
HIGH
Confidentiality impact
NONE
Integrity impact
HIGH
Availability impact
HIGH
local
low complexity
gnu
redhat
opensuse
canonical
CWE-190
NVD
Published: 2020-07-31
Updated: 2024-11-21

Summary

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.

Vulnerable Configurations

Part Description Count
Application
Gnu
8
OS
Redhat
6
OS
Opensuse
2
OS
Canonical
4

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Forced Integer Overflow
    This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.

References