CVE-2022-24859

Manipulated inline images can cause Infinite Loop in PyPDF2

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

PyPDF2 is an open source python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In versions prior to 1.27.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop if the PyPDF2 if the code attempts to get the content stream. The reason is that the last while-loop in `ContentStream._readInlineImage` only terminates when it finds the `EI` token, but never actually checks if the stream has already ended. This issue has been resolved in version `1.27.5`. Users unable to upgrade should validate and PDFs prior to iterating over their content stream.

PyPDF2 es una librería PDF de código abierto capaz de dividir, fusionar, recortar y transformar las páginas de los archivos PDF. En versiones anteriores a 1.27.5 un atacante que use esta vulnerabilidad puede diseñar un PDF que conlleva a un bucle infinito si el código de PyPDF2 intenta conseguir el flujo de contenido. La razón es que el último bucle while en "ContentStream._readInlineImage" sólo termina cuando encuentra el token "EI", pero nunca comprueba si el flujo ya ha terminado. Este problema ha sido resuelto en versión "1.27.5". Los usuarios que no puedan actualizarse deberán comprobar y PDFs antes de iterar sobre su flujo de contenido

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-02-10 CVE Reserved
2022-04-18 CVE Published
2024-07-10 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (6)

URL	Tag	Source
https://github.com/py-pdf/PyPDF2/releases/tag/1.27.5	Release Notes
https://lists.debian.org/debian-lts-announce/2022/06/msg00001.html	Mailing List
https://lists.debian.org/debian-lts-announce/2023/06/msg00013.html	Mailing List

URL	Date	SRC
https://github.com/py-pdf/PyPDF2/issues/329	2024-08-03
https://github.com/py-pdf/PyPDF2/security/advisories/GHSA-xcjx-m2pj-8g79	2024-08-03

URL	Date	SRC
https://github.com/py-pdf/PyPDF2/pull/740	2023-06-10

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Pypdf2 Project Search vendor "Pypdf2 Project"		Pypdf2 Search vendor "Pypdf2 Project" for product "Pypdf2"				< 1.27.5 Search vendor "Pypdf2 Project" for product "Pypdf2" and version " < 1.27.5"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected