Multiple vulnerabilities in OpenSSH



Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID N/A
CWE-ID CWE-310
CWE-22
Exploitation vector Network
Public exploit N/A
Vulnerable software
 OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor OpenSSH

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Padding oracle

EUVDB-ID: #VU6126

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

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

The vulnerability exists due to incomplete fix of CBC padding oracle countermeasures, allowing a variant of the attack fixed in OpenSSH 7.3 (SB2016080201 #3). A remote attacker can force the ssh client to use weak CBC ciphers and decrypt ssh session.

Successful exploitation of the vulnerability may allow an attacker to gain access to potentially sensitive information.

Mitigation

Update to version 7.5.

Vulnerable software versions

OpenSSH: 7.0p1 - 7.4p1

CPE2.3 External links

http://www.openssh.com/txt/release-7.5


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) Directory traversal

EUVDB-ID: #VU6127

Risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists in sftp-client in portable version of OpenSSH when processing file names. A remote attacker can trick the victim to connect to a malicious SFTP server and perform operations on files with specially crafted file names, containing directory traversal sequences (e.g. ../../).

Successful exploitation of the vulnerability may allow an attacker to overwrite arbitrary files on the victim’s system.

Mitigation

Update to version 7.5.

Vulnerable software versions

OpenSSH: 7.0p1 - 7.4p1

CPE2.3 External links

http://www.openssh.com/txt/release-7.5


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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