Privilege escalation in Linux kernel sctp

1) Use-after-free

EUVDB-ID: #VU83428

Risk: Low

CVSSv3.1: 6.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-25015

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the net/sctp/socket.c. A local authenticated user can trigger a use-after-free error and escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.14 - 4.14.15

External links

http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0ff660058b88d12625a783ce9e5c1371c87951f
http://syzkaller.appspot.com/bug?id=a8d38d1b68ffc744c53bd9b9fc1dbd6c86b1afe2
http://sites.google.com/view/syzscope/warning-held-lock-freed
http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.16
http://security.netapp.com/advisory/ntap-20210720-0002/

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.