CVE Vulnerabilities


Improper Validation of Specified Quantity in Input

Published: Feb 17, 2022 | Modified: Aug 08, 2023
CVSS 3.x
CVSS 2.x

A segmentation fault during PCF file parsing in pcf2bdf versions >=1.05 allows an attacker to trigger a program crash via a specially crafted PCF font file. This crash affects the availability of the software and dependent downstream components.


The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

Affected Software

Name Vendor Start Version End Version
Pcf2bdf Pcf2bdf_project 1.04 (including) 1.04 (including)
Pcf2bdf Pcf2bdf_project 1.05 (including) 1.05 (including)
Pcf2bdf Ubuntu bionic *
Pcf2bdf Ubuntu impish *
Pcf2bdf Ubuntu kinetic *
Pcf2bdf Ubuntu lunar *
Pcf2bdf Ubuntu trusty *
Pcf2bdf Ubuntu xenial *

Extended Description

Specified quantities include size, length, frequency, price, rate, number of operations, time, and others. Code may rely on specified quantities to allocate resources, perform calculations, control iteration, etc. When the quantity is not properly validated, then attackers can specify malicious quantities to cause excessive resource allocation, trigger unexpected failures, enable buffer overflows, etc.

Potential Mitigations

  • Assume all input is malicious. Use an “accept known good” input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, “boat” may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as “red” or “blue.”
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code’s environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.