FortiOS update for libssh2

1) Out-of-bounds read

EUVDB-ID: #VU18252

Risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3861

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 or perform denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when SSH packets with a padding length value greater than the packet length are parsed. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out of bounds read and gain access to sensitive information or perform denial of service attack.

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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) Out-of-bounds read

EUVDB-ID: #VU18253

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3862

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 or perform denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out of bounds read and gain access to sensitive information or perform denial of service attack.

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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 write

EUVDB-ID: #VU18254

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-2019-3863

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing total length of multiple keyboard interactive response messages that exceeds the value of unsigned char max characters. A remote attacker can trick the victim to connect to a malicious SSH server, trigger our of bounds write and execute arbitrary code on the system with privileges of the user, running the affected application.

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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) Out-of-bounds read

EUVDB-ID: #VU18026

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3860

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 when processing SFTP packets. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out-of-bounds read error and read contents of memory or crash the affected application.

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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) Out-of-bounds read

EUVDB-ID: #VU18027

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3859

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 when processing packets in _libssh2_packet_require() and _libssh2_packet_requirev() functions. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out-of-bounds read error and read contents of memory or crash the affected application.

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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) Integer overflow

EUVDB-ID: #VU18023

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-2019-3856

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow when parsing keyboard prompt requests. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

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

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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) Integer overflow

EUVDB-ID: #VU18025

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-2019-3857

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow when parsing SSH_MSG_CHANNEL_REQUEST packets. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

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

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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) Out-of-bounds read

EUVDB-ID: #VU18028

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3858

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 when processing SFTP packets. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out-of-bounds read error and read contents of memory or crash the affected application.

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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.

9) Integer overflow

EUVDB-ID: #VU18024

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-2019-3855

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow in the _libssh2_transport_read() function in transport.cwhen processing packet_lengthvalues. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

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

Mitigation

Update to versions 5.6.11, 6.0.7 or 6.2.1.

Vulnerable software versions

FortiOS: 5.6.0 - 6.2.0

CPE2.3

External links

http://fortiguard.com/psirt/FG-IR-19-099

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.

Risk	Medium
Patch available	YES
Number of vulnerabilities	9
CVE-ID	CVE-2019-3861 CVE-2019-3862 CVE-2019-3863 CVE-2019-3860 CVE-2019-3859 CVE-2019-3856 CVE-2019-3857 CVE-2019-3858 CVE-2019-3855
CWE-ID	CWE-125 CWE-787 CWE-190
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	FortiOS Operating systems & Components / Operating system
Vendor	Fortinet, Inc