SB2019032120 - Out-of-bounds read in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2018-19985)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 2.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when the function "hso_get_config_data" in "drivers/net/usb/hso.c" reads "if_num" from the USB device (as a u8) and uses it to index a small array. An authenticated local user with physical access to the system can use a malicious USB, trigger out-of-bounds read error and read contents of memory on the system.

Remediation

Install update from vendor's website.

References

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.148
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.13
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.91
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.170
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20