Ubuntu update for Linux kernel

Published: 2017-03-29 | Updated: 2021-10-11

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2017-7184
CWE-ID	CWE-122
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU6184

Risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-7184

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to execute arbitrary code on the target system with escalated privileges.

The vulnerability exists due to boundary error in xfrm_replay_verify_len() function in net/xfrm/xfrm_user.c in Linux kernel when validating data after an XFRM_MSG_NEWAE update. A local use can trigger heap-based buffer overflow by leveraging the CAP_NET_ADMIN capability and execute arbitrary code on the target system with root privileges.

Successful exploitation of this vulnerability may allow an attacker to compromise vulnerable system.

This vulnerability was demonstrated during the Pwn2Own competition at CanSecWest 2017 for the Ubuntu 16.10 linux-image-* package 4.8.0.41.52.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:

linux-image-gke 4.4.0.1009.11

linux-image-powerpc-e500mc 4.4.0.71.77

linux-image-4.4.0-1054-snapdragon 4.4.0-1054.58

linux-image-raspi2 4.4.0.1051.52

linux-image-powerpc-smp 4.4.0.71.77

linux-image-4.4.0-71-lowlatency 4.4.0-71.92

linux-image-generic 4.4.0.71.77