Red Hat update for kernel-rt
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2018-18281 CVE-2018-20856 CVE-2019-11599 |
| CWE-ID | CWE-284 CWE-416 CWE-362 |
| Exploitation vector | Local |
| Public exploit | Public exploit code for vulnerability #3 is available. |
| Vulnerable software Subscribe |
kernel-rt (Red Hat package) Operating systems & Components / Operating system package or component MRG Realtime Server applications / Application servers |
| Vendor |
Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Improper access control
EUVDB-ID: #VU15643
Risk: Low
CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-18281
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a local user to bypass certain security restrictions.
The vulnerability exists due to improper access restrictions to memory when performing TLB flushes after dropping pagetable locks with mremap() syscall, A local user can access a physical page of a stale TLB entry after ftruncate() syscall is called to remove entries from the pagetables of a task that is in the middle of mremap() syscall.
Successful exploitation of the vulnerability may allow an attacker to gain access to sensitive information, stored in process memory.
MitigationInstall updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.61.1.rt56.656.el6rt
MRG Realtime: 2
:
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.50.3.rt56.644.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.47.2.rt56.641.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.37.4.rt56.629.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:
- cpe:2.3:::::*:*:*:*:*:*:
http://access.redhat.com/errata/RHSA-2020:0100
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
EUVDB-ID: #VU19568
Risk: Low
CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-20856
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to execute arbitrary code on a targeted system.
The vulnerability exists due to a use-after-free error when the "__blk_drain_queue()" function in the "block/blk-core.c" file mishandles error cases. A local authenticated attacker can access the system and execute an application that submits malicious input, cause a use-after-free memory operation error and execute arbitrary code on the targeted system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
MitigationInstall updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.61.1.rt56.656.el6rt
MRG Realtime: 2
:
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.50.3.rt56.644.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.47.2.rt56.641.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.37.4.rt56.629.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:
- cpe:2.3:::::*:*:*:*:*:*:
http://access.redhat.com/errata/RHSA-2020:0100
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) Race condition
EUVDB-ID: #VU19996
Risk: Low
CVSSv3.1: 7.2 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
CVE-ID: CVE-2019-11599
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition with mmget_not_zero or get_task_mm calls and is related to fs/userfaultfd.c, mm/mmap.c, fs/proc/task_mmu.c, and drivers/infiniband/core/uverbs_main.c due to kernel does not use locking or other mechanisms to prevent vma layout or vma flags changes while it runs. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
MitigationInstall updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.61.1.rt56.656.el6rt
MRG Realtime: 2
:
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.50.3.rt56.644.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.47.2.rt56.641.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.37.4.rt56.629.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:
- cpe:2.3:::::*:*:*:*:*:*:
http://access.redhat.com/errata/RHSA-2020:0100
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.
