Ubuntu update for Linux kernel (HWE)
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2017-17712 CVE-2017-15115 CVE-2017-8824 CVE-2017-5715 |
| CWE-ID | CWE-362 CWE-416 CWE-200 |
| Exploitation vector | Local |
| Public exploit |
Public exploit code for vulnerability #3 is available. Public exploit code for vulnerability #4 is available. |
| Vulnerable software Subscribe |
Ubuntu Operating systems & Components / Operating system |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Race condition
EUVDB-ID: #VU9772
Risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-17712
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to gain elevated privileges on the target system.
The weakness exists due to a race condition in inet->hdrincl in the raw_sendmsg() function in net/ipv4/raw.c in the Linux kernel. A local attacker can trigger uninitialized stack pointer usage and execute arbitrary code with root privileges.
Successful exploitation of the vulnerability may result in system compromise.
Update the affected packages
Ubuntu: 16.04
CPE2.3 External linkshttp://www.ubuntu.com/usn/usn-3581-2/
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.
2) Use-after-free error
EUVDB-ID: #VU9764
Risk: Low
CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-15115
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists due to the sctp_do_peeloff function in net/sctp/socket.c in the Linux kernel does not check whether the intended netns is used in a peel-off action. A local attacker can make specially crafted system calls, trigger use-after-free error and cause the system to crash.
Successful exploitation of the vulnerability results in denial of service.
Update the affected packages
Ubuntu: 16.04
CPE2.3 External linkshttp://www.ubuntu.com/usn/usn-3581-2/
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.
3) Use-after-free error
EUVDB-ID: #VU9767
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2017-8824
CWE-ID:
CWE-416 - Use After Free
Exploit availability: Yes
DescriptionThe vulnerability allows a local attacker to gain elevated privileges or cause DoS condition on the target system.
The weakness exists due to an error in the dccp_disconnect function in net/dccp/proto.c in the Linux kernel. A local attacker can make specially crafted AF_UNSPEC connect system call during the DCCP_LISTEN state, trigger use-after-free error and gain root privileges or cause the system to crash.
Update the affected packages
Ubuntu: 16.04
CPE2.3 External linkshttp://www.ubuntu.com/usn/usn-3581-2/
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. However, proof of concept for this vulnerability is available.
4) Information disclosure
EUVDB-ID: #VU9883
Risk: Low
CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2017-5715
CWE-ID:
CWE-200 - Information exposure
Exploit availability: Yes
DescriptionThe vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists in Intel CPU hardware due to improper implementation of the speculative execution of instructions. A local attacker can utilize branch target injection, execute arbitrary code, perform a side-channel attack and read sensitive memory information.
MitigationUpdate the affected packages
Ubuntu: 16.04
CPE2.3 External linkshttp://www.ubuntu.com/usn/usn-3581-2/
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. However, proof of concept for this vulnerability is available.
