Multiple vulnerabilities in FreeBSD



Published: 2020-12-01
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2020-25577
CVE-2020-7469
CWE ID CWE-119
CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
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FreeBSD
Operating systems & Components / Operating system

Vendor FreeBSD Foundation

Security Advisory

1) Buffer overflow

Risk: Low

CVSSv3: 5.9 [CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-25577

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows an attacker to execute arbitrary code on the target system.

There are two vulnerabilities in rtsold(8) when processing RDNSS and DNSSL options. An  attacker with the ability to connect to a physical network can send specially crafted packets to the daemon, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0, 11.1, 11.2, 11.3, 11.4, 12.0, 12.1, 12.2

CPE External links

https://www.freebsd.org/security/advisories/FreeBSD-SA-20:32.rtsold.asc

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) Use-after-free

Risk: Medium

CVSSv3: 7.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-7469

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a use-after-free error when processing ICMPv6 error message. A remote attacker can send a specially crafted ICMPv6 message, trigger a use-after-free error and read contents of freed kernel memory.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0, 11.1, 11.2, 11.3, 11.4, 12.0, 12.1, 12.2

CPE External links

https://www.freebsd.org/security/advisories/FreeBSD-SA-20:31.icmp6.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.