The FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with the --with-openssl option, which allows remote attackers to cause a denial of service (application crash) via a plaintext HTTP message.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2016-2390 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of squid as shipped with Red Hat Enterprise Linux versions 5, 6 and 7, as they are not shipped with a vulnerable version of squid, and no currently backported patch would introduce the bug.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | squid | Not affected |
| Red Hat Enterprise Linux 6 | squid | Not affected |
| Red Hat Enterprise Linux 5 | squid | Not affected |
Vulmon