SB2018041003 - Multiple vulnerabilities in NetBSD
Published: April 10, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 vulnerabilities.
1) Privilege escalation (CVE-ID: N/A)
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 a mistake the Xen-amd64 port of NetBSD, where iopl was unintentionally set to ring3. A local attacker can gain elevated privileges and read from and write to the CPU's I/O ports.
2) Use-after-free error (CVE-ID: N/A)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to several possible use-after-frees existed in the MPLS code. A remote attacker can trigger memory corruption and cause the system to panic.
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to memory leak in the IPv6-NBR entry point. A remote attacker can trigger memory corruption and cause the kernel to run out of memory.
4) Double free error (CVE-ID: N/A)
CWE-ID: CWE-415 - Double Free
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to double-free bug in the Pim6 (IPv6 multicast) entry point. A remote attacker can trigger memory corruption and cause the kernel to panic.
5) Improper input validation (CVE-ID: N/A)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to two sysctls wrongfully allowed IPv4 source-routed packets to be accepted by the kernel. A remote attacker can send specially crafted source-routed packets and cause kernel to panic.
6) Improper input validation (CVE-ID: N/A)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to signedness bug in NetBSD's implementation of the PF firewall. A remote attacker can send specially crafted TCP-SYN packet while PF had a configuration of the type "pass in [...] tcp [...] modulate state", trigger out-of-bounds read and cause the system to crash.
Remediation
Install update from vendor's website.