Red Hat Enterprise Linux 7.5 Extended Update Support update for kernel
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 |
| CWE-ID | CWE-190 CWE-400 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Red Hat Enterprise Linux for Power, little endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, big endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux for IBM z Systems - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux Server - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux EUS Compute Node Operating systems & Components / Operating system kernel (Red Hat package) Operating systems & Components / Operating system package or component |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Integer overflow
EUVDB-ID: #VU18813
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-2019-11477
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to integer overflow when handling TCP Selective Acknowledgments (SACKs) due to incorrect processing of TCP_SKB_CB(skb)->tcp_gso_segs value in Linux kernel. A remote non-authenticated attacker can send specially crafted network traffic to the affected system, trigger integer overflow and render the system unavailable.
Successful exploitation of the vulnerability allows a remote attacker to perform denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.5
Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.5
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.5
Red Hat Enterprise Linux Server - Extended Update Support: 7.5
Red Hat Enterprise Linux EUS Compute Node: 7.5
kernel (Red Hat package): before 3.10.0-862.34.2.el7
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_little_endian_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_big_endian_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_ibm_z_systems_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red hat enterprise linux server - extended update support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_eus_compute_node:7.5:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2019:1482
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.
2) Resource exhaustion
EUVDB-ID: #VU18946
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-2019-11478
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to an error when processing TCP Selective Acknowledgment (SACK) sequences within the Linux kernel TCP retransmission queue implementation in tcp_fragment. A remote non-authenticated attacker can send specially crafted network traffic to the affected system and perform a denial of service (DoS) attack.
Mitigation
Install updates from vendor's website.
Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.5
Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.5
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.5
Red Hat Enterprise Linux Server - Extended Update Support: 7.5
Red Hat Enterprise Linux EUS Compute Node: 7.5
kernel (Red Hat package): before 3.10.0-862.34.2.el7
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_little_endian_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_big_endian_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_ibm_z_systems_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red hat enterprise linux server - extended update support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_eus_compute_node:7.5:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2019:1482
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.
3) Resource exhaustion
EUVDB-ID: #VU18947
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-2019-11479
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to presence of hard-coded MSS value (48 bytes) in the Linux kernel source code. A remote attacker can fragment TCP resend queues significantly more than if a larger MSS were enforced and perform denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.5
Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.5
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.5
Red Hat Enterprise Linux Server - Extended Update Support: 7.5
Red Hat Enterprise Linux EUS Compute Node: 7.5
kernel (Red Hat package): before 3.10.0-862.34.2.el7
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_little_endian_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power_big_endian_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_ibm_z_systems_-_extended_update_support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red hat enterprise linux server - extended update support:7.5:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red_hat_enterprise_linux_eus_compute_node:7.5:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2019:1482
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.
