Ubuntu update for Linux kernel (HWE)



Published: 2017-09-18
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2017-1000251
CVE-2017-7541
CWE-ID CWE-121
CWE-119
Exploitation vector Local network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Operating systems & Components / Operating system

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Stack-based buffer overflow

EUVDB-ID: #VU8329

Risk: Low

CVSSv3.1: 8.6 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-1000251

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: Yes

Description

The vulnerability allows an adjacent attacker to execute arbitrary code on the host system.

The weakness exists due to a stack-based buffer overflow in the processing of L2CAP configuration. An adjacent attacker can submit a specially crafted Bluetooth protocol, trigger memory corruption in the Bluetooth stack and execute arbitrary code in kernel space.

Successful exploitation of the vulnerability may result in host system compromise.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:
linux-image-lowlatency-hwe-16.04 4.10.0.35.37
linux-image-4.10.0-35-generic 4.10.0-35.39~16.04.1
linux-image-4.10.0-35-lowlatency 4.10.0-35.39~16.04.1
linux-image-generic-lpae-hwe-16.04 4.10.0.35.37
linux-image-generic-hwe-16.04 4.10.0.35.37
linux-image-4.10.0-35-generic-lpae 4.10.0-35.39~16.04.1

Vulnerable software versions

Ubuntu: 16.04

External links

http://www.ubuntu.com/usn/usn-3419-2/


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Buffer overflow

EUVDB-ID: #VU7585

Risk: Low

CVSSv3.1: 8.1 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7541

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to boundary error in brcmf_cfg80211_mgmt_tx() function in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the Linux kernel before 4.12.3. A local user can create a specially crafted NL80211_CMD_FRAME Netlink packet and trigger DoS conditions or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may allow an attacker to obtain elevated privileges.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:
linux-image-lowlatency-hwe-16.04 4.10.0.35.37
linux-image-4.10.0-35-generic 4.10.0-35.39~16.04.1
linux-image-4.10.0-35-lowlatency 4.10.0-35.39~16.04.1
linux-image-generic-lpae-hwe-16.04 4.10.0.35.37
linux-image-generic-hwe-16.04 4.10.0.35.37
linux-image-4.10.0-35-generic-lpae 4.10.0-35.39~16.04.1

Vulnerable software versions

Ubuntu: 16.04

External links

http://www.ubuntu.com/usn/usn-3419-2/


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.



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