SB2022100428 - Multiple vulnerabilities in OpenSSH

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: N/A)

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.

2) Double Free (CVE-ID: N/A)

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.

3) Double Free (CVE-ID: N/A)

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.

Remediation

Install update from vendor's website.

References

• https://www.openssh.com/releasenotes.html#9.1