CVE-2024-43167 Unbound: null pointer dereference in unbound
A null pointer dereference in the Unbound library allows attackers to cause a denial of service via specific API call sequences.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-43167?
CVE-2024-43167 is a low-severity vulnerability in Red Hat Enterprise Linux 6, published on 8 Aug 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound. This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly.
Weakness: CWE-476
Which versions are affected by CVE-2024-43167?
Linux distribution packages (8)
unbound SUSE:Linux Enterprise Micro 5.5 | All versions | 1.20.0-150100.10.16.1 |
unbound SUSE:Linux Enterprise Module for Basesystem 15 SP5 | All versions | 1.20.0-150100.10.16.1 |
unbound SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 1.20.0-150600.23.6.1 |
unbound SUSE:Linux Enterprise Module for Package Hub 15 SP5 | All versions | 1.20.0-150100.10.16.1 |
unbound SUSE:Linux Enterprise Module for Package Hub 15 SP6 | All versions | 1.20.0-150600.23.6.1 |
unbound openSUSE:Leap 15.5 | All versions | 1.20.0-150100.10.16.1 |
unbound openSUSE:Leap 15.6 | All versions | 1.20.0-150600.23.6.1 |
unbound openSUSE:Tumbleweed | All versions | 1.21.0-1.1 |
How do I fix CVE-2024-43167?
Apply the vendor's patch.
Is CVE-2024-43167 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-43167 exists.
Sources
Also known as AZL-47771, AZL-47779, DEBIAN-CVE-2024-43167, GHSA-f34v-4q4f-pf5q, MGASA-2024-0293, SUSE-SU-2024:3074-1 and 3 more.