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py-pdf/pypdf2 · Security

Manipulated inline images can cause Infinite Loop in PyPDF2

GHSA ID
GHSA-xcjx-m2pj-8g79
CVE ID
CVE-2022-24859
Severity
medium
Published
Updated
CVSS
6.2 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v3
6.2 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop if the PyPDF2 user wrote the following code:

from PyPDF2 import PdfFileReader, PdfFileWriter
from PyPDF2.pdf import ContentStream

reader = PdfFileReader("malicious.pdf", strict=False)
for page in reader.pages:
    ContentStream(page.getContents(), reader)

Patches

PyPDF2==1.27.5 and later are patched.

Credits to Sebastian Krause for finding (issue) and fixing (PR) it.

CWEs

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

References