CVE-2023-35838 Misconfiguration in n/a
An attacker can trick WireGuard users into blocking traffic to specific non-RFC1918 IP addresses, causing a denial of service for those services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-35838?
CVE-2023-35838 is a medium-severity vulnerability in n/a, published on 9 Aug 2023. 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
The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that traffic to a local network that uses non-RFC1918 IP addresses is blocked. This allows an adversary to trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "LocalNet attack resulting in the blocking of traffic" rather than to only WireGuard.
Weakness: CWE-610
Which versions are affected by CVE-2023-35838?
1 open source package ship an affected version, including wireguard. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
wireguard PyPI | All versions to 0.5.3 | None |
Products include Wireguard Wireguard.
How do I fix CVE-2023-35838?
No fix has been published for CVE-2023-35838 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-35838 being exploited?
There is no known exploitation of CVE-2023-35838 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-q424-r5hc-33qq, PYSEC-2023-321, UBUNTU-CVE-2023-35838.