Multiple vulnerabilities in FreeBSD



Published: 2019-08-21 | Updated: 2023-03-29
Risk Medium
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2019-5611
CVE-2019-5612
CVE-2019-5603
CWE-ID CWE-20
CWE-399
CWE-125
CWE-264
Exploitation vector Network
Public exploit Public exploit code for vulnerability #5 is available.
Vulnerable software
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FreeBSD
Operating systems & Components / Operating system

Vendor FreeBSD Foundation

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU20352

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incompatibility of firewall rules created with older versions of ipfw(8) utility that support jail keyword. The issue results in rules with the jail keyword are not applied, leading to potential unauthorized access to the services, protected by the firewall rules.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.3

External links

http://www.freebsd.org/security/advisories/FreeBSD-EN-19:17.ipfw.asc


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource management error

EUVDB-ID: #VU20353

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to absent handling of certain instructions in bhyve(8). A remote attacker with access to guest operating system can use the unsupported instructions to crash the bhyve hypervisor.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.0

External links

http://www.freebsd.org/security/advisories/FreeBSD-EN-19:16.bhyve.asc


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Input validation error

EUVDB-ID: #VU20354

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-5611

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a missing check in the code of m_pulldown(9) when processing IPv6 packets. A remote attacker can send specially crafted IPv6 traffic to the affected system and perform denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.0

External links

http://www.freebsd.org/security/advisories/FreeBSD-SA-19:22.mbuf.asc


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Out-of-bounds read

EUVDB-ID: #VU20355

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-5612

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the kernel driver for /dev/midistat. A local user can trigger out-of-bounds read error and read kernel memory contents.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.0

External links

http://www.freebsd.org/security/advisories/FreeBSD-SA-19:23.midi.asc


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU20356

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-5603

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a reference count overflow within the mqueuefs(5). A local user can obtain access to files, directories, sockets opened by processes owned by other users, including access to files outside of the jail. A local user can run a specially crafted application to gain elevated privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.0

External links

http://packetstormsecurity.com/files/153752/FreeBSD-Security-Advisory-FreeBSD-SA-19-15.mqueuefs.html
http://security.FreeBSD.org/advisories/FreeBSD-SA-19:15.mqueuefs.asc
http://security.FreeBSD.org/advisories/FreeBSD-SA-19:24.mqueuefs.asc
http://security.netapp.com/advisory/ntap-20190814-0003/


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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