Multiple vulnerabilities in OpenSSH



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID N/A
CWE-ID CWE-119
CWE-415
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 3 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU67904

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing SSH banners in ssh-keyscan(1). A remote attacker can use a specially crafted banner to trigger a one-byte buffer overflow and perform a denial of service (DoS) attack.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 6.0 - 9.0p1

CPE2.3 External links

http://www.openssh.com/releasenotes.html#9.1


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) Double Free

EUVDB-ID: #VU67905

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in ssh-keygen(1) when reading files. A remote attacker can trick the victim into using a specially crafted file to trigger a double free error when handling the path of file hashing step in signing/verify code and crash the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 6.0 - 9.0p1

CPE2.3 External links

http://www.openssh.com/releasenotes.html#9.1


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.

3) Double Free

EUVDB-ID: #VU67906

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in ssh-keysign(8) when reading files. A remote attacker can trick the victim into using a specially crafted file to trigger a double free error and crash the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 8.9p1 - 9.0p1

CPE2.3 External links

http://www.openssh.com/releasenotes.html#9.1


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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