Use-after-free in Linux kernel

1) Use-after-free

EUVDB-ID: #VU31126

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/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-2019-8956

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the "sctp_sendmsg()" function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.19.22 - 4.20.7

External links

http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21
http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.8
http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ba59fb0273076637f0add4311faa990a5eec27c0
http://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/
http://support.f5.com/csp/article/K12671141
http://usn.ubuntu.com/3930-1/
http://usn.ubuntu.com/3930-2/

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.