CVE-2019-18614 Memory corruption in n/a
A buffer overflow in Cypress CYW20735 Bluetooth firmware allows remote code execution or denial of service via oversized packets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-18614?
CVE-2019-18614 is a high-severity memory corruption vulnerability in n/a, published on 16 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On the Cypress CYW20735 evaluation board, any data that exceeds 384 bytes is copied and causes an overflow. This is because the maximum BLOC buffer size for sending and receiving data is set to 384 bytes, but everything else is still configured to the usual size of 1092 (which was used for everything in the previous CYW20719 and later CYW20819 evaluation board). To trigger the overflow, an attacker can either send packets over the air or as unprivileged local user. Over the air, the minimal PoC is sending "l2ping -s 600" to the target address prior to any pairing. Locally, the buffer overflow is immediately triggered by opening an ACL or SCO connection to a headset. This occurs because, in WICED Studio 6.2 and 6.4, BT_ACL_HOST_TO_DEVICE_DEFAULT_SIZE and BT_ACL_DEVICE_TO_HOST_DEFAULT_SIZE are set to 384.
Weakness: CWE-787
Which versions are affected by CVE-2019-18614?
It affects 1 product.
Products include Cypress Cyw20735 Firmware.
How do I fix CVE-2019-18614?
No fix has been published for CVE-2019-18614 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2019-18614 being exploited?
There is no known exploitation of CVE-2019-18614 in the wild and no public exploit code.
Sources
Also known as GHSA-2hf8-gw5c-2f9c.