SB2017111801 - Amazon Linux AMI update for kernel
Published: November 18, 2017
Security Bulletin ID
SB2017111801
Severity
Low
Patch available
YES
Number of vulnerabilities
5
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Null pointer dereference (CVE-ID: CVE-2017-15299)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists due to the KEYS subsystem mishandles use of add_key for a key that already exists but is uninstantiated. A local attacker can supply specially crafted keys, trigger null pointer dereference and cause the service to crash.
Successful exploitation of the vulnerability results in denial of service.
2) Memory leak (CVE-ID: CVE-2017-12190)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists due to an out-of-memory condition. A local attacker can cause a memory leak and possible system lock up.
3) NULL pointer derefenrece (CVE-ID: CVE-2017-12193)
The vulnerability allows a local user to perform a denial of service (DoS) attack.The vulnerability exists in the assoc_array implementation in which a new leaf is added that needs to go into a node that happens to be full. A local user can trigger NULL pointer dereference error and crash the kernel.
4) Memory corruption (CVE-ID: CVE-2017-1000255)
The vulnerability allows a local user to execute arbitrary code with escalated privileges.The vulnerability exists due to a boundary error in the Linux kernel's when handling signal frame on PowerPC systems. A malicious local user process could craft a signal frame allowing an attacker to corrupt memory and execute arbitrary code on the target system with escalated privileges.
5) Race condition (CVE-ID: CVE-2017-15951)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists due to the KEYS subsystem does not correctly synchronize the actions of updating versus finding a key in the "negative" state. A local attacker can make a specially crafted system calls, trigger race condition and cause the service to crash.
Successful exploitation of the vulnerability results in denial of service.
Remediation
Install update from vendor's website.