Ubuntu update for freerdp2

Published: 2022-11-25

Risk	Medium
Patch available	YES
Number of vulnerabilities	8
CVE-ID	CVE-2022-39282 CVE-2022-39283 CVE-2022-39316 CVE-2022-39317 CVE-2022-39318 CVE-2022-39319 CVE-2022-39320 CVE-2022-39347
CWE-ID	CWE-200 CWE-125 CWE-129 CWE-369 CWE-36
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system libfreerdp-client2-2 (Ubuntu package) Operating systems & Components / Operating system package or component libfreerdp-server2-2 (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 8 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU68264

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39282

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 exposure of uninitialized data in FreeRDP client on unix systems using /parallel command line switch. The application can read uninitialized data and send it to the RDP server it is connected to.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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) Information disclosure

EUVDB-ID: #VU68265

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39283

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 information disclosure. All FreeRDP based clients when using the /video command line switch can read uninitialized data, decode it as audio/video and display the result.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.

3) Out-of-bounds read

EUVDB-ID: #VU69594

Risk: Medium

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

CVE-ID: CVE-2022-39316

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in ZGFX decoder. A malicious server can trick a FreeRDP based client to read out of bound data and try to decode it.

Successful exploitation of the vulnerability may allows remote code execution.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.

4) Improper Validation of Array Index

EUVDB-ID: #VU69592

Risk: Medium

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

CVE-ID: CVE-2022-39317

CWE-ID: CWE-129 - Improper Validation of Array Index

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a missing range check for input offset index in ZGFX decoder. A malicious server can trick a FreeRDP based client to read out of bound data and try to decode it.

Successful exploitation of the vulnerability may allows remote code execution.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.

5) Division by zero

EUVDB-ID: #VU69593

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39318

CWE-ID: CWE-369 - Divide By Zero

Exploit availability: No

Description

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

The vulnerability exists due to a division by zero error in urbdrc channel. A malicious server can pass specially crafted data to the application and crash it.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.

6) Out-of-bounds read

EUVDB-ID: #VU69591

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39319

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in urbdrc channel. A malicious server can trick a FreeRDP based client to read out of bound data and send it back to the server.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.

7) Out-of-bounds read

EUVDB-ID: #VU69589

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39320

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition within the urbdrc channel. A malicious server can trick the FreeRDP based client to read out of bound data and send it back to the server.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.

8) Absolute Path Traversal

EUVDB-ID: #VU69588

Risk: Medium

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

CVE-ID: CVE-2022-39347

CWE-ID: CWE-36 - Absolute Path Traversal

Exploit availability: No

Description

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

The vulnerability exists due to missing path canonicalization and base path check for drive channel. A malicious server can trick the FreeRDP client to read files outside the shared directory.

Mitigation

Update the affected package freerdp2 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libfreerdp-client2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

libfreerdp-server2-2 (Ubuntu package): before 2.8.1+dfsg1-0ubuntu1.1

External links

http://ubuntu.com/security/notices/USN-5734-1

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.