SB2022061595 - Anolis OS update for squid:4 module

Description

This security bulletin contains information about 8 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2021-28116)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the handling of the WCCP protocol. A remote attacker can send specially crafted data and corrupt Squids list of known WCCP routers and divert client traffic to attacker controlled routers.

This attack is limited to Squid proxy with WCCPv2 enabled and IP spoofing of a router IP address configured as trusted in squid.conf.

2) Input validation error (CVE-ID: CVE-2021-28651)

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

The vulnerability exists due to insufficient input validation when resolving "urn:" resource identifiers. A remote attacker can trick a user behind the proxy server to click on a specially crafted "urn:" link that leads to a server under attacker's control and force Squid to consume arbitrarily large amounts of memory on the server. 

3) Memory leak (CVE-ID: CVE-2021-28652)

The vulnerability allows a remote client to perform DoS attack on the target system.

The vulnerability exists due memory leak due to incorrect parser validation in Cache Manager API. A remote trusted client with Cache Manager API access privilege can perform denial of service attack.

4) Input validation error (CVE-ID: CVE-2021-28662)

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

The vulnerability exists due to insufficient input validation when processing HTTP responses. A remote attacker who controls a malicious web page can send specially crafted HTTP response and perform a denial of service attack against the proxy server. The issue trigger is a header which can be expected to exist in HTTP traffic without any malicious intent by the server.

5) Input validation error (CVE-ID: CVE-2021-31806)

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

The vulnerability exists due to insufficient validation of user-supplied input when performing HTTP Range requests. A remote proxy client can send specially crafted HTTP request via the proxy server  and perform a denial of service (DoS) attack.

6) Resource management error (CVE-ID: CVE-2021-31807)

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

The vulnerability exists due to improper management of memory within the application when processing HTTP Range header. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

7) Integer overflow (CVE-ID: CVE-2021-31808)

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

The vulnerability exists due to insufficient validation of user-supplied input when delivering responses from HTTP Range requests. A remote proxy client can send specially crafted HTTP request via the proxy server, force the server to initiate a necessary response, trigger integer overflow in Squid and perform a denial of service (DoS) attack.

8) Input validation error (CVE-ID: CVE-2021-33620)

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

The vulnerability can be triggered by a header that can be expected to exist in HTTP traffic without any malicious intent by the server. A remote server can trigger the vulnerability and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://anas.openanolis.cn/errata/detail/ANSA-2022:0457