Privilege escalation in Linux Kernel
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2018-12714 CVE-2018-12904 |
| CWE-ID | CWE-787 CWE-264 |
| Exploitation vector | Local |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. |
| Vulnerable software Subscribe |
Linux kernel Operating systems & Components / Operating system |
| Vendor | Linux Foundation |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Privilege escalation
EUVDB-ID: #VU13505
Risk: Low
CVSSv3.1: 7.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2018-12714
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists due to the filter-parsing component, as defined in the kernel/trace/trace_events_filter.c source code file of the affected software, could be called without a filter, which would result in an N=0 case. A local attacker can make perf_event_open and mmap system calls that submit malicious input, trigger a slab out-of-bounds write condition in the predicate_parse function and cause the system to crash or execute arbitrary code with elevated privileges.
Successful exploitation of the vulnerability may result in complete system compromise.
MitigationInstall update from vendor's website.
Vulnerable software versionsLinux kernel: 4.15 - 4.17.2
External linkshttp://bugzilla.kernel.org/show_bug.cgi?id=200019
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: #VU13516
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-2018-12904
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists due to insufficient checking of the current privilege level (CPL) for Virtual Machine Extensions (VMX) instructions by the arch/x86/kvm/vmx.c source code file when nested virtualization is used. A local attacker can cause a targeted L1 Kernel-based Virtual Machine (KVM) guest to exit and gain elevated privileges on the targeted L1 system, which could be used to conduct further attacks.
MitigationInstall update from vendor's website.
Vulnerable software versionsLinux kernel: 4.15 - 4.17.2
External linksQ & 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.
