CVE-2023-36807 : pypdf is a pure-python PDF library capable of splitting, merging, cropping, and

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. 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 metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with https://github.com/py-pdf/pypdf/pull/1331 which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify `PyPDF2/generic/_data_structures.py::read_object` to an an error throwing case. See GHSA-hm9v-vj3r-r55m for details.

Published 2023-06-30 19:15:09

Updated 2023-07-10 16:32:45

Source GitHub, Inc.

View at NVD, CVE.org

Products affected by CVE-2023-36807

Pypdf Project » Pypdf » Version: 2.10.5
cpe:2.3:a:pypdf_project:pypdf:2.10.5:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2023-36807

EPSS FAQ

0.09%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 41 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-36807

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: None Availability: High
6.2	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	2.5	3.6	GitHub, Inc.
Attack Vector: Local Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2023-36807

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

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2023-36807

https://github.com/py-pdf/pypdf/issues/1329

Infinite loop while reading metadata · Issue #1329 · py-pdf/pypdf · GitHub
Exploit;Issue Tracking;Vendor Advisory
https://github.com/py-pdf/pypdf/pull/1331

ROB: Fix infinite loop due to Invalid object by pubpub-zz · Pull Request #1331 · py-pdf/pypdf · GitHub
Patch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m

Possible Infinite Loop when reading malformed objects · Advisory · py-pdf/pypdf · GitHub
Exploit;Mitigation;Patch;Vendor Advisory

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Vulnerability Details : CVE-2023-36807

Products affected by CVE-2023-36807

Exploit prediction scoring system (EPSS) score for CVE-2023-36807

CVSS scores for CVE-2023-36807

CWE ids for CVE-2023-36807

References for CVE-2023-36807