Red Hat Enterprise MRG 2 update for kernel-rt
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2017-18595 CVE-2019-19768 CVE-2020-10711 |
| CWE-ID | CWE-415 CWE-416 CWE-476 |
| Exploitation vector | Network |
| Public exploit | N/A |
| 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) Double Free
EUVDB-ID: #VU21716
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-18595
CWE-ID:
CWE-415 - Double Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges in the system.
The vulnerability exists due to a boundary error within the allocate_trace_buffer() function in the kernel/trace/trace.c. A local user can run a specially crafted application to trigger a double free error and execute arbitrary code on the target system with elevated privileges.
MitigationInstall updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.65.1.rt56.663.el6rt
MRG Realtime: 2
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.65.1.rt56.663.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.64.1.rt56.662.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- 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:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:
http://access.redhat.com/errata/RHSA-2020:2242
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: #VU27503
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-19768
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the __blk_add_trace() function in kernel/trace/blktrace.c. A local user can run a specially crafted program, trigger a use-after-free error and execute arbitrary code on the system with elevated privileges.
Install updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.65.1.rt56.663.el6rt
MRG Realtime: 2
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.65.1.rt56.663.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.64.1.rt56.662.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- 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:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:
http://access.redhat.com/errata/RHSA-2020:2242
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) NULL pointer dereference
EUVDB-ID: #VU28180
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-10711
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the Linux kernel's SELinux subsystem when importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated.
A remote attacker can send specially crafted packets the affected system, trigger a NULL pointer dereference error and crash the Linux kernel.
Install updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.65.1.rt56.663.el6rt
MRG Realtime: 2
CPE2.3- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.65.1.rt56.663.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.64.1.rt56.662.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
- 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:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:
http://access.redhat.com/errata/RHSA-2020:2242
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
