CVE-2023-36464 – pypdf2

Package

Manager: pip
Name: pypdf2
Vulnerable Version: >=2.2.0 <=3.0.1

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00023 pctl0.04611

Details

pypdf and PyPDF2 possible Infinite Loop when a comment isn't followed by a character ### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop if `__parse_content_stream` is executed. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case if the user extracted text from such a PDF. Example Code and a PDF that causes the issue: ```python from pypdf import PdfReader # https://objects.githubusercontent.com/github-production-repository-file-5c1aeb/3119517/11367871?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20230627%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20230627T201018Z&X-Amz-Expires=300&X-Amz-Signature=d71c8fd9181c4875f0c04d563b6d32f1d4da6e7b2e6be2f14479ce4ecdc9c8b2&X-Amz-SignedHeaders=host&actor_id=1658117&key_id=0&repo_id=3119517&response-content-disposition=attachment%3Bfilename%3DMiFO_LFO_FEIS_NOA_Published.3.pdf&response-content-type=application%2Fpdf reader = PdfReader("MiFO_LFO_FEIS_NOA_Published.3.pdf") page = reader.pages[0] page.extract_text() ``` The issue was introduced with https://github.com/py-pdf/pypdf/pull/969 ### Patches The issue was fixed with https://github.com/py-pdf/pypdf/pull/1828 ### Workarounds It is recommended to upgrade to `pypdf>=3.9.0`. PyPDF2 users should migrate to pypdf. If you cannot update your version of pypdf, you should modify `pypdf/generic/_data_structures.py`: ``` OLD: while peek not in (b"\r", b"\n"): NEW: while peek not in (b"\r", b"\n", b""): ```

Metadata

Created: 2023-06-30T20:33:57Z
Modified: 2023-07-07T17:19:37Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/06/GHSA-4vvm-4w3v-6mr8/GHSA-4vvm-4w3v-6mr8.json
CWE IDs: ["CWE-835"]
Alternative ID: GHSA-4vvm-4w3v-6mr8
Finding: F138
Auto approve: 1