Ubuntu update for Linux kernel (HWE)

1) Heap-based buffer overflow

EUVDB-ID: #VU6612

Risk: Medium

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

CVE-ID: CVE-2017-7477

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

Exploit availability: No

Description

The vulnerability allows a remote attacker on the local network execute arbitrary code on the target system.

The weakness exists due to heap-based buffer overflow in the skb_to_sgvec() function in the MACsec driver. A remote attacker can use a MAX_SKB_FRAGS+1 size in conjunction with the NETIF_F_FRAGLIST feature, trigger memory corruption and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability results in arbitrary code execution.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:

linux-image-4.8.0-52-lowlatency 4.8.0-52.55~16.04.1

linux-image-generic-hwe-16.04 4.8.0.52.23

linux-image-4.8.0-52-generic-lpae 4.8.0-52.55~16.04.1

linux-image-lowlatency-hwe-16.04 4.8.0.52.23

linux-image-4.8.0-52-generic 4.8.0-52.55~16.04.1

linux-image-generic-lpae-hwe-16.04 4.8.0.52.23

Vulnerable software versions

Ubuntu: 16.04

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*

External links

https://www.ubuntu.com/usn/usn-3292-2/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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