SB2017103110 - Ubuntu update for Linux kernel (GCP)
Published: October 31, 2017
Security Bulletin ID
SB2017103110
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Adjecent network
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Assertion failure (CVE-ID: CVE-2017-1000252)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The KVM subsystem in the Linux kernel through 4.13.3 allows guest OS users to cause a denial of service (assertion failure, and hypervisor hang or crash) via an out-of bounds guest_irq value, related to arch/x86/kvm/vmx.c and virt/kvm/eventfd.c.
2) Privilege escalation (CVE-ID: CVE-2017-10663)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 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:U/U:Clear
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The weakness exists due to improper validation of the blkoff and segno arrays by the sanity_check_ckpt function in fs/f2fs/super.c in the Linux kernel. a local attacker can execute arbitrary code with root privileges.
Remediation
Install update from vendor's website.