Ubuntu update for sssd

1) Information disclosure

EUVDB-ID: #VU14328

Risk: Low

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: CVE-2018-10852

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to too wide permissions in the UNIX pipe which sudo uses to contact SSSD and read the available sudo rules from SSSD. A remote attacker can send a message using the same raw protocol that sudo and SSSD use can read the sudo rules available for any user.

Mitigation

Update the affected package sssd to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.04

sssd (Ubuntu package): before 2.4.0-1ubuntu6.1

External links

http://ubuntu.com/security/notices/USN-5067-1

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) Security restrictions bypass

EUVDB-ID: #VU17376

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-16838

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

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to bypass security restrictions on the system.

The vulnerability exists due to a flaw in sssd Group Policy Objects implementation when the GPO is not readable by SSSD due to a too strict permission settings on the server side. A remote attacker can bypass security restrictions.

Mitigation

Update the affected package sssd to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.04

sssd (Ubuntu package): before 2.4.0-1ubuntu6.1

External links

http://ubuntu.com/security/notices/USN-5067-1

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.

3) Improper access control

EUVDB-ID: #VU17121

Risk: Low

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

CVE-ID: CVE-2019-3811

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows an adjacent authenticated attacker to bypass security restrictions.

The vulnerability exists due to the return of '/' (the root directory) instead of '' (the empty string / no home directory) if a user was configured with no home directory set. An adjacent attacker can bypass services that restrict the user's filesystem access to within their home directory through chroot().

Mitigation

Update the affected package sssd to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.04

sssd (Ubuntu package): before 2.4.0-1ubuntu6.1

External links

http://ubuntu.com/security/notices/USN-5067-1

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.

4) Command Injection

EUVDB-ID: #VU56000

Risk: Medium

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3621

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in the sssctl command within the logs-fetch and cache-expire subcommands. An attacker can trick the root user into running a specially crafted sssctl command, such as via sudo, and execute arbitrary code with root privileges.

Mitigation

Update the affected package sssd to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.04

sssd (Ubuntu package): before 2.4.0-1ubuntu6.1

External links

http://ubuntu.com/security/notices/USN-5067-1

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.