Multiple out of bounds read and integer overflow vulnerabilities were found in tcpdump affecting the decoding of various protocols. An attacker could create a crafted pcap file or send specially crafted packets to the network segment where tcpdump is running in live capture mode (without -w) which could cause it to display incorrect data, crash or enter an infinite loop.
Find out more about CVE-2016-7938 from the MITRE CVE dictionary dictionary and NIST NVD.
Red Hat Product Security has rated these issues as having Moderate security impact. These issues may be fixed in a future minor release of Red Hat Enterprise Linux 7. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
| CVSS3 Base Score | 6.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (tcpdump) | RHSA-2017:1871 | 2017-08-01 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 6 | tcpdump | Will not fix |
| Red Hat Enterprise Linux 5 | tcpdump | Will not fix |
When invoked with the "-w" option, to write raw packets to a pcap file (for forensic purposes or offline examination), tcpdump does not use the protocol decoding subsystem and is not affected by these flaws. Red Hat Product Security recommends that any unattended uses of tcpdump use this option to ensure uninterrupted packet capture.
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