SB2021121013 - Multiple vulnerabilities in Privoxy
Published: December 10, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Input validation error (CVE-ID: CVE-2021-44540)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input in the "get_url_spec_param" function. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
2) Cross-site scripting (CVE-ID: CVE-2021-44543)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in the template name. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
3) Input validation error (CVE-ID: CVE-2021-44542)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input in the "send_http_request" function. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
4) Input validation error (CVE-ID: CVE-2021-44541)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input in the "process_encrypted_request_headers" function. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.