Red Hat update for ISC DHCP
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2018-1087 CVE-2018-1088 CVE-2018-1111 CVE-2018-8897 |
| CWE-ID | CWE-703 CWE-61 CWE-77 |
| Exploitation vector | Local network |
| Public exploit |
Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. Vulnerability #4 is being exploited in the wild. |
| Vulnerable software |
Red Hat Virtualization Host Web applications / Remote management & hosting panels Red Hat Virtualization Server applications / Virtualization software |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Improper check or handling of exceptional conditions
EUVDB-ID: #VU12520
Risk: Low
CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2018-1087
CWE-ID:
CWE-703 - Improper Check or Handling of Exceptional Conditions
Exploit availability: No
DescriptionThe vulnerability allows an adjacent attacker to cause DoS condition or gain elevated privileges on the target system.
The weakness exists in the Linux kernel KVM hypervisor due to improper handling of debug exceptions delivered after a stack switch operation via mov SS or pop SS instructions. During the stack switch operation, the exceptions are deferred. An adjacent attacker can cause the service to crash or gain root privileges.
Install update from vendor's website.
Vulnerable software versionsRed Hat Virtualization Host: 4
Red Hat Virtualization: 4
CPE2.3- cpe:2.3:a:red_hat:red_hat_virtualization_host:4:*:*:*:*:*:*:*
- cpe:2.3:a:red_hat:red_hat_virtualization:4:*:*:*:*:*:*:*
https://access.redhat.com/errata/RHSA-2018:1524
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Symlink attack
EUVDB-ID: #VU12150
Risk: Low
CVSSv4.0: 7.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2018-1088
CWE-ID:
CWE-61 - UNIX Symbolic Link (Symlink) Following
Exploit availability: Yes
DescriptionThe vulnerability allows an adjacent unauthenticated attacker to gain elevated privileges on the target system.
The weakness exists in the snapshot scheduler due to improper security restrictions during the mounting of gluster volumes. An adjacent attacker can access a gluster node, perform symbolic link attack that is designed to schedule malicious cronjobs and gain root privileges.
Install update from vendor's website.
Vulnerable software versionsRed Hat Virtualization Host: 4
Red Hat Virtualization: 4
CPE2.3- cpe:2.3:a:red_hat:red_hat_virtualization_host:4:*:*:*:*:*:*:*
- cpe:2.3:a:red_hat:red_hat_virtualization:4:*:*:*:*:*:*:*
https://access.redhat.com/errata/RHSA-2018:1524
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
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.
3) Command injection
EUVDB-ID: #VU12743
Risk: Low
CVSSv4.0: 7 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear]
CVE-ID: CVE-2018-1111
CWE-ID:
CWE-77 - Command injection
Exploit availability: Yes
DescriptionThe vulnerability allows a physical attacker to execute arbitrary commands with elevated privileges on the target system.
The weakness exists in the NetworkManager integration script due to command injection. A physical attacker can return specially crafted data via dhcp and execute arbitrary commands with root privileges.
Install update from vendor's website.
Vulnerable software versionsRed Hat Virtualization Host: 4
Red Hat Virtualization: 4
CPE2.3- cpe:2.3:a:red_hat:red_hat_virtualization_host:4:*:*:*:*:*:*:*
- cpe:2.3:a:red_hat:red_hat_virtualization:4:*:*:*:*:*:*:*
https://access.redhat.com/errata/RHSA-2018:1524
Q & A
Can this vulnerability be exploited remotely?
No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.
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) Privilege escalation
EUVDB-ID: #VU12450
Risk: Low
CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear]
CVE-ID: CVE-2018-8897
CWE-ID:
CWE-703 - Improper Check or Handling of Exceptional Conditions
Exploit availability: Yes
DescriptionThe vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists due to improper implementation of Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) on multiple system kernels, which results in an unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS. A local user can execute arbitrary code with elevated privileges.
Install update from vendor's website.
Vulnerable software versionsRed Hat Virtualization Host: 4
Red Hat Virtualization: 4
CPE2.3- cpe:2.3:a:red_hat:red_hat_virtualization_host:4:*:*:*:*:*:*:*
- cpe:2.3:a:red_hat:red_hat_virtualization:4:*:*:*:*:*:*:*
https://access.redhat.com/errata/RHSA-2018:1524
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?
Yes. This vulnerability is being exploited in the wild.
