SB2019100715 - Multiple vulnerabilities in PuTTY
Published: October 7, 2019
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-17067)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to tamper with application connection.
The vulnerability exists due to PuTTY when installed on Windows OS improperly opens port-forwarding listening sockets. A local user can listen on the same port and intercept all incoming connection packets.
2) Resource management error (CVE-ID: CVE-2019-17069)
CWE-ID: CWE-399 - Resource Management Errors
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error when processing SSH1_MSG_DISCONNECT message. A remote attacker can trick the victim to connect to a remote SSH-1 server, send a specially crafted SSH1_MSG_DISCONNECT message and crash the affected PuTTY client.
3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-17068)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists due to an error with "bracketed paste mode" protection implementation. A remote attacker can affect current user's session with a malicious clipboard content and execute arbitrary commands on a remote system with privileges of the current user.
Remediation
Install update from vendor's website.