Ubuntu update for Linux kernel
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2017-5754 CVE-2017-17863 CVE-2017-16995 CVE-2017-17862 CVE-2017-17864 |
| CWE-ID | CWE-200 CWE-190 CWE-119 CWE-20 CWE-401 |
| Exploitation vector | Local |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #3 is available. |
| Vulnerable software Subscribe |
Ubuntu Operating systems & Components / Operating system |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Information disclosure
EUVDB-ID: #VU9882
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-2017-5754
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 side-channel attacks, which are also referred to as Meltdown attacks. A local attacker can execute arbitrary code, perform a side-channel analysis of the data cache and gain access to sensitive information including memory from the CPU cache.
MitigationUpdate the affected packages
Ubuntu: 17.10
External linkshttp://www.ubuntu.com/usn/usn-3523-1/
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.
2) Privilege escalation
EUVDB-ID: #VU9779
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-2017-17863
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to gain elevated privileges on the target system.
The weakness exists due to kernel/bpf/verifier.c in the Linux kernel does not check the relationship between pointer values and the BPF stack. A local attacker can run a specially crafted application to trigger integer overflow or invalid memory access and execute arbitrary code with root privileges.
Successful exploitation of the vulnerability may result in system compromise.
Update the affected packages
Ubuntu: 17.10
External linkshttp://www.ubuntu.com/usn/usn-3523-1/
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) Memory corruption
EUVDB-ID: #VU9753
Risk: Low
CVSSv3.1: 8.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
CVE-ID: CVE-2017-16995
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a local attacker to cause DoS condition or execute arbitrary code on the target system.
The weakness exists in the check_alu_op function due to boundary error. A local attacker can trigger memory corruption, cause the service to crash or execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
Update the affected packages
Ubuntu: 17.10
External linkshttp://www.ubuntu.com/usn/usn-3523-1/
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, a fully functional exploit for this vulnerability is available.
4) Denial of service
EUVDB-ID: #VU9778
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-2017-17862
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists due to kernel/bpf/verifier.c in the Linux kernel improperly explores unreachable code paths, even though it would still be processed by JIT compilers. A local attacker can run a specially crafted application, trigger an improper branch-pruning logic issue and cause the system to crash.
Successful exploitation of the vulnerability results in denial of service.
Update the affected packages
Ubuntu: 17.10
External linkshttp://www.ubuntu.com/usn/usn-3523-1/
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.
5) Memory leak
EUVDB-ID: #VU9780
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-17864
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to obtain potentially sensitive information on the target system.
The weakness exists due to kernel/bpf/verifier.c in the Linux kernel mishandles states_equal comparisons between the pointer data type and the UNKNOWN_VALUE data type. A local attacker can trigger a memory leak and obtain potentially sensitive address information.
Update the affected packages
Ubuntu: 17.10
External linkshttp://www.ubuntu.com/usn/usn-3523-1/
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.
