ZDI-21-157: (0Day) Squid Cache WCCP Protocol Out-Of-Bounds Read Information Disclosure Vulnerability
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Squid Cache. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the WCCP protocol. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the "nobody" user.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Squid Web Proxy Cache |
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Reference Links
Frequently Asked Questions
What is the severity of ZDI-21-157?
The severity of ZDI-21-157 is considered high due to its potential for remote information disclosure.
How do I fix ZDI-21-157?
To fix ZDI-21-157, update your Squid Cache installation to the latest version that addresses this vulnerability.
What types of systems are affected by ZDI-21-157?
ZDI-21-157 affects installations of Squid Cache that use the WCCP protocol.
Can ZDI-21-157 be exploited without authentication?
Yes, ZDI-21-157 can be exploited without authentication, making it particularly dangerous.
What kind of information can be disclosed due to ZDI-21-157?
ZDI-21-157 can lead to the disclosure of sensitive information that may be processed by affected installations of Squid Cache.
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- collector/zdi-advisory
- source/ZDI
- alias/ZDI-21-157
- alias/ZDI-CAN-11610
- agent/software-canonical-lookup
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- vendor/squid
- canonical/squid web proxy cache