Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended restrictions and gain access to a backend proxy via a CONNECT request.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2015-5400 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 2.3 |
|---|---|
| Base Metrics | AV:A/AC:M/Au:S/C:P/I:N/A:N |
| Access Vector | Adjacent Network |
| Access Complexity | Medium |
| Authentication | Single |
| Confidentiality Impact | Partial |
| Integrity Impact | None |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | squid | Will not fix |
| Red Hat Enterprise Linux 6 | squid | Will not fix |
| Red Hat Enterprise Linux 5 | squid | Will not fix |
Vulmon