Gentoo update for libvirt

Published: 2022-10-17

Risk	Medium
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2020-14339 CVE-2020-25637 CVE-2021-3631 CVE-2021-3667 CVE-2022-0897
CWE-ID	CWE-200 CWE-415 CWE-732 CWE-667
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software Subscribe	Gentoo Linux Operating systems & Components / Operating system dev-python/libvirt-python Operating systems & Components / Operating system package or component app-emulation/libvirt Operating systems & Components / Operating system package or component
Vendor	Gentoo

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU46198

Risk: Medium

CVSSv3.1: 7.8 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14339

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The vulnerability exists due to libvirt leaks a file descriptor for /dev/mapper/control. A remote user on guest operating system can obtain leaked descriptor address and escalate privileges on the system.

Mitigation

Update the affected packages.
app-emulation/libvirt to version: 8.2.0
dev-python/libvirt-python to version: 8.2.0

Vulnerable software versions

Gentoo Linux: All versions

dev-python/libvirt-python: before 8.2.0

app-emulation/libvirt: before 8.2.0

External links

http://security.gentoo.org/glsa/202210-06

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Double Free

EUVDB-ID: #VU48591

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-2020-25637

CWE-ID: CWE-415 - Double Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in the libvirt API, responsible for requesting information about network interfaces of a running QEMU domain. A local client connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on the system.

Mitigation

Update the affected packages.
app-emulation/libvirt to version: 8.2.0
dev-python/libvirt-python to version: 8.2.0

Vulnerable software versions

Gentoo Linux: All versions

dev-python/libvirt-python: before 8.2.0

app-emulation/libvirt: before 8.2.0

External links

http://security.gentoo.org/glsa/202210-06

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.

3) Incorrect permission assignment for critical resource

EUVDB-ID: #VU62735

Risk: Medium

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3631

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

Exploit availability: No

Description

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

The vulnerability exists due to an error in the way SELinux MCS category pairs for VMs' dynamic labels in security/security_selinux.c. An attacker with access to the guest OS can access files labeled for another guest.

Mitigation

Update the affected packages.
app-emulation/libvirt to version: 8.2.0
dev-python/libvirt-python to version: 8.2.0

Vulnerable software versions

Gentoo Linux: All versions

dev-python/libvirt-python: before 8.2.0

app-emulation/libvirt: before 8.2.0

External links

http://security.gentoo.org/glsa/202210-06

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

4) Improper locking

EUVDB-ID: #VU62734

Risk: Low

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

CVE-ID: CVE-2021-3667

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service attack (DoS) on the target system.

The vulnerability exists due to double-locking error in the virStoragePoolLookupByTargetPath API in libvirt in storage/storage_driver.c. The storagePoolLookupByTargetPath() function does not properly release a locked object (virStoragePoolObj) on ACL permission failure. Clients connecting to the read-write socket with limited ACL permissions can use this vulnerability to acquire the lock and prevent other users from accessing storage pool/volume APIs. As a result a local user can perform a denial of service (DoS) attack.

Mitigation

Update the affected packages.
app-emulation/libvirt to version: 8.2.0
dev-python/libvirt-python to version: 8.2.0

Vulnerable software versions

Gentoo Linux: All versions

dev-python/libvirt-python: before 8.2.0

app-emulation/libvirt: before 8.2.0

External links

http://security.gentoo.org/glsa/202210-06

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) Improper locking

EUVDB-ID: #VU62739

Risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-0897

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service attack (DoS).

The vulnerability exists due to double-locking error within the nwfilterConnectNumOfNWFilters() function in nwfilter/nwfilter_driver.c in libvirt. An local user can abuse the libvirt API virConnectNumOfNWFilters to crash the network filter management daemon (libvirtd/virtnwfilterd).

Mitigation

Update the affected packages.
app-emulation/libvirt to version: 8.2.0
dev-python/libvirt-python to version: 8.2.0

Vulnerable software versions

Gentoo Linux: All versions

dev-python/libvirt-python: before 8.2.0

app-emulation/libvirt: before 8.2.0

External links

http://security.gentoo.org/glsa/202210-06

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.