CVE-2017-9445

Ubuntu Security Notice USN-3341-1

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.

En systemd hasta la versión 233, ciertos tamaños pasados a la función dns_packet_new en systemd-resolved pueden causar que asigne un búfer que es muy pequeño. Un servidor DNS malicioso puede aprovechar esto por medio de una respuesta con una carga útil TCP especialmente creada para engañar a systemd-resolved en la asignación de un búfer que es muy pequeño, y posteriormente escribir datos arbitrarios más allá del final de la misma.

An out-of-bounds write was discovered in systemd-resolved when handling specially crafted DNS responses. A remote attacker could potentially exploit this to cause a denial of service or execute arbitrary code.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-06-05 CVE Reserved
2017-06-27 CVE Published
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (4)

URL	Tag	Source
http://www.securityfocus.com/bid/99302	Third Party Advisory
http://www.securitytracker.com/id/1038806	Third Party Advisory
https://launchpad.net/bugs/1695546	Broken Link

URL	Date	SRC

URL	Date	SRC
http://openwall.com/lists/oss-security/2017/06/27/8	2022-01-31

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Systemd Project Search vendor "Systemd Project"		Systemd Search vendor "Systemd Project" for product "Systemd"				>= 223 <= 233 Search vendor "Systemd Project" for product "Systemd" and version " >= 223 <= 233"		-		Affected