Out-of-bounds read in OpenSSH - #VU73777
Published: March 17, 2023
Vulnerability identifier: #VU73777
CSH Severity: Low
CVSS v4: 5.1 [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]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition in the getrrsetbyname(3) function within the VerifyHostKeyDNS feature. A remote attacker can send a specifically crafted DNS response to the ssh client, trigger an out-of-bounds read of adjacent stack data of the ssh client and perform a denial of service (DoS) attack.
Affected software
OpenSSH
LANTIME Operating System Firmware (LTOS)
LANTIME Operating System Firmware (LTOS)
Remediation
Install updates from vendor's website.
OpenSSH - update to 9.3p1
LANTIME Operating System Firmware (LTOS) - update to 7.06.014
LANTIME Operating System Firmware (LTOS) - update to 7.06.014