SB2017041804 - Multiple vulnerabilities in Linux Kernel
Published: April 18, 2017 Updated: May 7, 2018
Security Bulletin ID
SB2017041804
Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Security restrictions bypass (CVE-ID: CVE-2016-9604)
The vulnerability allows a local attacker to write arbitrary files on the target system.The weakness exists due to root can gain direct access to an internal keyring, such as '.dns_resolver' or '.builtin_trusted_keys' upstream, by joining it as its session keyring. A local attacker can bypass module signature verification by adding a new public key of its own devising to the keyring.
2) Resource exhaustion (CVE-ID: CVE-2017-7472)
The vulnerability allows a local attacker to cause DoD condition on the target system.The weakness exists in the KEYS subsystem due to memory consumption. A local attacker can cause the service to crash via a series of KEY_REQKEY_DEFL_THREAD_KEYRING keyctl_set_reqkey_keyring calls.
Remediation
Install update from vendor's website.