Heap-based buffer overflow in the Icmp6::Recv function in icmp/Icmp6.cc in the pinger utility in Squid before 3.5.16 and 4.x before 4.0.8 allows remote servers to cause a denial of service (performance degradation or transition failures) or write sensitive information to log files via an ICMPv6 packet.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2016-3947 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 5, 6 and 7 as they did not include support for ICMP pinging and the 'pinger' binary.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 5.8 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:P/A:P |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | Partial |
| 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