SB2020051274 - Multiple vulnerabilities in FreeBSD

Description

This security bulletin contains information about 3 vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2019-15878)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/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 vulnerability exists due to the SCTP layer does improper checking when an application tries to update a shared key. A local user can trigger a use-after-free error by specific sequences of updating shared keys and closing the SCTP association and cause a kernel panic.

2) Use-after-free (CVE-ID: CVE-2019-15879)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/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 user to escalate privileges on the system.

The vulnerability exists due to a race condition in cryptodev module. A local user can run a specially crafted application to trigger a use-after-free error and overwrite arbitrary kernel memory.

3) Input validation error (CVE-ID: CVE-2019-15880)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 vulnerability exists due to insufficient validation of user-supplied MAC key length in cryptodev module. A local user can pass an overly long MAC key and cause kernel panic.

Remediation

Install update from vendor's website.

References

• https://www.freebsd.org/security/advisories/FreeBSD-SA-20:14.sctp.asc
• https://www.freebsd.org/security/advisories/FreeBSD-SA-20:15.cryptodev.asc
• https://www.freebsd.org/security/advisories/FreeBSD-SA-20:16.cryptodev.asc