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CVE-2023-36807

Infinite Loop when reading malformed objects in pypdf

Published: Jun 30, 2023Updated: Nov 21, 2024 Sources: CVE List NVD GHSA BDUCWE-835
NVD MITRE
6.2CVSSMEDIUM
EPSS Score
0.5%
Top 60.0%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-835

Affected Products

Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
Astra Linux Special EditionООО «РусБИТех-Астра»
On-premOS
Operating Systems / linux-distro
PyPDF2Matthew Peveler
Library
OSS Libraries
pypdfpy-pdf
On-prem
OSS Libraries / pypi
pypdfpypdf project
Library
OSS Libraries / generic-library
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «русбитех-астра»commercialRUOperating Systemsaka rusbitech-astra
matthew pevelerOSS Librariesaka pypdf2
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2
pypdf projectoss-projectOSS Libraries
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/py-pdf/pypdf/commit/e6531a25325e7e0174b6a1ba03b57320b5227f6b
github.com
https://github.com/py-pdf/pypdf/issues/1329
github.com
https://github.com/py-pdf/pypdf/pull/1331
github.com
and 11 more references View all →

Timeline

Published
Jun 30, 2023
Last Updated
Nov 21, 2024

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