Quick answers
- Is CVE-2016-7984 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2016-7984 being exploited in the wild.
- How severe is CVE-2016-7984?
- Critical severity, with a CVSS score of 9.8, published 28 January 2017.
- Which products and versions are affected?
- tcpdump tcpdump before 4.9.0.
- Is there a fix for CVE-2016-7984?
- A patch was published on 2017-01-29: Debian Security Advisory DSA-3775-1 issued Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2016-7984 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2016-7984?
- Check whether you run Tcpdump. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A buffer overflow vulnerability exists in the TFTP (Trivial File Transfer Protocol) parser within tcpdump versions prior to 4.9.0. The flaw is located in the tftp_print() function in print-tftp.c and is triggered when the tool attempts to parse malformed TFTP packets. An unauthenticated remote attacker can exploit this by sending specially crafted packets to a network segment where tcpdump is performing live capture, or by providing a malicious pcap file for offline analysis. Successful exploitation can lead to a denial-of-service (application crash) or arbitrary code execution with the privileges of the user running tcpdump. The issue is resolved in version 4.9.0.
Affected products
- tcpdump tcpdump before 4.9.0
Timeline
- 2017-01-26: advisory: Debian security release announcement for version 4.9.0-1
- 2017-01-27: disclosed: NVD publication date
- 2017-01-29: patched: Debian Security Advisory DSA-3775-1 issued
- 2017-02-21: advisory: Gentoo Security Advisory GLSA 201702-30 issued