CVE-2023-1314 Local Privilege Escalation Vulnerability in cloudflared's Installer
Local attackers can escalate privileges by exploiting a world-writable directory in the Windows installer to delete or replace system files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-1314?
CVE-2023-1314 is a high-severity vulnerability in cloudflared, published on 21 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been discovered in cloudflared's installer (<= 2023.3.0) for Windows 32-bits devices that allows a local attacker with no administrative permissions to escalate their privileges on the affected device. This vulnerability exists because the MSI installer used by cloudflared relied on a world-writable directory.
An attacker with local access to the device (without Administrator rights) can use symbolic links to trick the MSI installer into deleting files in locations that the attacker would otherwise have no access to. By creating a symlink from the world-writable directory to the target file, the attacker can manipulate the MSI installer's repair functionality to delete the target file during the repair process.
Exploitation of this vulnerability could allow an attacker to delete important system files or replace them with malicious files, potentially leading to the affected device being compromised.
The cloudflared client itself is not affected by this vulnerability, only the installer for 32-bit Windows devices.
Weakness: CWE-59
Which versions are affected by CVE-2023-1314?
3 open source packages ship an affected version, including github.com/cloudflare/cloudflared. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cloudflare/cloudflared Go | All versions | 0.0.0-20230313153246-f686da832f85 |
github.com/cloudflare/cloudflared Go | All versions | 0.0.0-20230313153246-f686da832f85 |
github.com/cloudflare/cloudflared Go | All versions | 0.0.0-20230313153246-f686da832f85 |
Products include Cloudflare Cloudflared.
How do I fix CVE-2023-1314?
Upgrade github.com/cloudflare/cloudflared to 0.0.0-20230313153246-f686da832f85 or later.
Is CVE-2023-1314 being exploited?
There is no known exploitation of CVE-2023-1314 in the wild and no public exploit code.
Other vulnerabilities in cloudflared
Sources
Also known as GHSA-7mjv-x3jf-545x, GO-2023-1652.