Privilege escalation in Linux kernel USB driver

1) Use-after-free

EUVDB-ID: #VU29958

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12464

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the usb_sg_cancel() function in drivers/usb/core/message.c in the Linux kernel. A local user can trigger a use-after-free error during file transfer to USB driver and execute arbitrary code on the system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.6.1 - 5.6.7

External links

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.8
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=056ad39ee9253873522f6469c3364964a322912b
http://github.com/torvalds/linux/commit/056ad39ee9253873522f6469c3364964a322912b
http://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
http://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
http://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
http://lkml.org/lkml/2020/3/23/52
http://patchwork.kernel.org/patch/11463781/
http://security.netapp.com/advisory/ntap-20200608-0001/
http://usn.ubuntu.com/4387-1/
http://usn.ubuntu.com/4388-1/
http://usn.ubuntu.com/4389-1/
http://usn.ubuntu.com/4390-1/
http://usn.ubuntu.com/4391-1/
http://www.debian.org/security/2020/dsa-4698
http://www.debian.org/security/2020/dsa-4699

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.