CVE-2018-9918

Ubuntu Security Notice USN-3638-1

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

libqpdf.a in QPDF through 8.0.2 mishandles certain "expected dictionary key but found non-name object" cases, allowing remote attackers to cause a denial of service (stack exhaustion), related to the QPDFObjectHandle and QPDF_Dictionary classes, because nesting in direct objects is not restricted.

libqpdf.a en QPDF hasta la versión 8.0.2 gestiona de manera incorrecta ciertos casos de "clave de diccionario esperada pero objeto sin nombre encontrado". Esto permite que los atacantes remotos provoquen una denegación de servicio (agotamiento de la pila), relacionado con las clases QPDFObjectHandle y QPDF_Dictionary. Esto se debe a que la anidación en los objetos directos no está restringida.

It was discovered that QPDF incorrectly handled certain malformed files. A remote attacker could use this issue to cause QPDF to crash, resulting in a denial of service, or possibly execute arbitrary code.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-04-10 CVE Reserved
2018-04-10 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-674: Uncontrolled Recursion

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://github.com/qpdf/qpdf/issues/202	2024-08-05

URL	Date	SRC
https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223	2019-10-03

URL	Date	SRC
https://usn.ubuntu.com/3638-1	2019-10-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qpdf Project Search vendor "Qpdf Project"		Qpdf Search vendor "Qpdf Project" for product "Qpdf"				<= 8.0.2 Search vendor "Qpdf Project" for product "Qpdf" and version " <= 8.0.2"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				17.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "17.10"		-		Affected