Multiple vulnerabilities in FreeBSD
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2020-7463 CVE-2020-7461 CVE-2020-7462 |
| CWE-ID | CWE-617 CWE-824 CWE-416 CWE-122 |
| Exploitation vector | Local network |
| Public exploit | Public exploit code for vulnerability #4 is available. |
| Vulnerable software Subscribe |
FreeBSD Operating systems & Components / Operating system |
| Vendor | FreeBSD Foundation |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Reachable Assertion
EUVDB-ID: #VU46229
Risk: Low
CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-617 - Reachable Assertion
Exploit availability: No
DescriptionThe vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper handling of exec(3) calls in Linux ABI layer (Linuxulator) when calling processes with multiple threads. A local user can run a specially crafted program to trigger an assertion failure and cause kernel panic. MitigationInstall updates from vendor's website.
Vulnerable software versionsFreeBSD: 11.0 - 12.1
External linkshttp://www.freebsd.org/security/advisories/FreeBSD-EN-20:17.linuxthread.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.
2) Access of Uninitialized Pointer
EUVDB-ID: #VU46228
Risk: Low
CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-824 - Access of Uninitialized Pointer
Exploit availability: No
DescriptionThe vulnerability allows a local user to perform a denial of service (DoS) attack.
The
vulnerability exists due to an error in internal interface used by
getfsstat(2) compatibility system. A local unprivileged user can run a program that calls getfsstat(2) with an invalid argument, which causes getfsstat(2) to free an uninitialized pointer and results in kernel panic.
Install updates from vendor's website.
Vulnerable software versionsFreeBSD: 11.0 - 11.4
External linkshttp://www.freebsd.org/security/advisories/FreeBSD-EN-20:18.getfsstat.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.
3) Use-after-free
EUVDB-ID: #VU46227
Risk: Low
CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-7463
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error when processing SCTP messages. A local user can send large user messages from multiple threads on the same socket., trigger a use-after-free error and crash the system.
Install updates from vendor's website.
Vulnerable software versionsFreeBSD: 11.0 - 12.1
External linkshttp://www.freebsd.org/security/advisories/FreeBSD-SA-20:25.sctp.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.
4) Heap-based buffer overflow
EUVDB-ID: #VU46226
Risk: Medium
CVSSv3.1: 7.9 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2020-7461
CWE-ID:
CWE-122 - Heap-based Buffer Overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when parsing option 119 data in DHCP packets in dhclient(8). A remote attacker on the local network can send specially crafted data to the DHCP client, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsFreeBSD: 11.0 - 12.1
External linkshttp://www.freebsd.org/security/advisories/FreeBSD-SA-20:26.dhclient.asc
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
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.
5) Use-after-free
EUVDB-ID: #VU46225
Risk: Low
CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-7462
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error when processing IPv6 packets. A local user can send IPv6 Hop-by-Hop options over the loopback interface and trigger kernel panic.
Install updates from vendor's website.
Vulnerable software versionsFreeBSD: 11.0 - 11.4
External linkshttp://www.freebsd.org/security/advisories/FreeBSD-SA-20:24.ipv6.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.
