CVE-2023-32067 0-byte UDP payload DoS in c-ares
An attacker can cause a denial of service in applications using c-ares by sending forged zero-length UDP packets, triggering an erroneous connection shutdown.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-32067?
CVE-2023-32067 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 25 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2023-32067?
It affects 3 products.
Linux distribution packages (40)
c-ares AlmaLinux:8 | All versions | 1.13.0-6.el8_8.2 |
c-ares-devel AlmaLinux:8 | All versions | 1.13.0-6.el8_8.2 |
c-ares AlmaLinux:9 | All versions | 1.17.1-5.el9_2.1 |
c-ares-devel AlmaLinux:9 | All versions | 1.17.1-5.el9_2.1 |
c-ares Red Hat:enterprise_linux:7::client | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-devel Red Hat:enterprise_linux:7::client | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-devel Red Hat:enterprise_linux:7::computenode | All versions | 0:1.10.0-3.el7_9.1 |
c-ares Red Hat:enterprise_linux:7::server | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-debuginfo Red Hat:enterprise_linux:7::server | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-devel Red Hat:enterprise_linux:7::server | All versions | 0:1.10.0-3.el7_9.1 |
c-ares Red Hat:enterprise_linux:7::workstation | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 0:1.10.0-3.el7_9.1 |
c-ares-devel Red Hat:enterprise_linux:7::workstation | All versions | 0:1.10.0-3.el7_9.1 |
c-ares Red Hat:enterprise_linux:8::baseos | All versions | 0:1.13.0-6.el8_8.2 |
c-ares-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.13.0-6.el8_8.2 |
c-ares-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:1.13.0-6.el8_8.2 |
c-ares-devel Red Hat:enterprise_linux:8::baseos | All versions | 0:1.13.0-6.el8_8.2 |
c-ares-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:1.17.1-5.el9_2.1 |
c-ares-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:1.17.1-5.el9_2.1 |
c-ares-devel Red Hat:enterprise_linux:9::appstream | All versions | 0:1.17.1-5.el9_2.1 |
c-ares Red Hat:enterprise_linux:9::baseos | All versions | 0:1.17.1-5.el9_2.1 |
c-ares-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:1.17.1-5.el9_2.1 |
c-ares-debugsource Red Hat:enterprise_linux:9::baseos | All versions | 0:1.17.1-5.el9_2.1 |
c-ares Red Hat:rhel_aus:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
c-ares-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
c-ares-debugsource Red Hat:rhel_aus:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
c-ares-devel Red Hat:rhel_aus:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
c-ares Red Hat:rhel_aus:8.4::baseos | All versions | 0:1.13.0-5.el8_4.2 |
c-ares-debuginfo Red Hat:rhel_aus:8.4::baseos | All versions | 0:1.13.0-5.el8_4.2 |
c-ares-debugsource Red Hat:rhel_aus:8.4::baseos | All versions | 0:1.13.0-5.el8_4.2 |
c-ares-devel Red Hat:rhel_aus:8.4::baseos | All versions | 0:1.13.0-5.el8_4.2 |
c-ares Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1.13.0-5.el8_1.1 |
c-ares-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1.13.0-5.el8_1.1 |
c-ares-debugsource Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1.13.0-5.el8_1.1 |
c-ares-devel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1.13.0-5.el8_1.1 |
c-ares Red Hat:rhel_e4s:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
c-ares-debuginfo Red Hat:rhel_e4s:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
c-ares-debugsource Red Hat:rhel_e4s:8.2::baseos | All versions | 0:1.13.0-5.el8_2.1 |
Products include C-Ares Project C-Ares, Debian Debian Linux, Fedoraproject Fedora.
How do I fix CVE-2023-32067?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-32067 being exploited?
There is no known exploitation of CVE-2023-32067 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALSA-2023:3559, ALSA-2023:3584, AZL-26913, AZL-26918, AZL-26921, AZL-26937 and 24 more.