# CVE-2018-17974: tcpreplay: An issue was discovered in Tcpreplay 4.3.0 beta1

CVE-2018-17974 is fixed in tcpreplay on 1 platform by tcpreplay 4.2.6-1ubuntu0.1~esm1 (version 4.2.6-1ubuntu0.1~esm1), released October 16, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-17974
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0099
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 3, 2018

## Description

An issue was discovered in Tcpreplay 4.3.0 beta1. A heap-based buffer over-read was triggered in the function dlt_en10mb_encode() of the file plugins/dlt_en10mb/en10mb.c, due to inappropriate values in the function memmove(). The length (pktlen + ctx -> l2len) can be larger than source value (packet + ctx->l2len) because the function fails to ensure the length of a packet is valid. This leads to Denial of Service.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tcpreplay Ubuntu 18.04.6 LTS (bionic) | 4.2.6-1ubuntu0.1~esm1 | [tcpreplay 4.2.6-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tcpreplay-4.2.6-1ubuntu0.1-esm1.md) | Oct 16, 2018 |

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