CVE-2023-32067

0-byte UDP payload DoS in c-ares

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.

A vulnerability was found in c-ares. This issue occurs due to a 0-byte UDP payload that can cause a Denial of Service.

Hannes Moesl discovered that c-ares incorrectly handled certain ipv6 addresses. An attacker could use this issue to cause c-ares to crash, resulting in a denial of service, or possibly execute arbitrary code. Xiang Li discovered that c-ares incorrectly handled certain UDP packets. A remote attacker could possibly use this issue to cause c-res to crash, resulting in a denial of service.

*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

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-05-01 CVE Reserved
2023-05-25 CVE Published
2025-02-13 CVE Updated
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (10)

URL	Tag	Source
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1	Release Notes
https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00034.html	Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY	Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7	Mailing List
https://security.gentoo.org/glsa/202310-09	Third Party Advisory
https://security.netapp.com/advisory/ntap-20240605-0004
https://www.debian.org/security/2023/dsa-5419	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2023-32067	2023-07-12
https://bugzilla.redhat.com/show_bug.cgi?id=2209502	2023-07-12

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
C-ares Project Search vendor "C-ares Project"		C-ares Search vendor "C-ares Project" for product "C-ares"				< 1.19.1 Search vendor "C-ares Project" for product "C-ares" and version " < 1.19.1"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				37 Search vendor "Fedoraproject" for product "Fedora" and version "37"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				38 Search vendor "Fedoraproject" for product "Fedora" and version "38"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected