# CVE-2018-17000: libtiff5: A NULL pointer dereference in the function _TIFFmemcmp at tif_unix.c (called from TIFFWriteDirectoryTagTransferfuncti...

CVE-2018-17000 is fixed in 4 products on 1 platform, first by libtiff-opengl 4.0.9-5ubuntu0.2, released February 8, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-17000
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0325
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 12, 2018

## Description

A NULL pointer dereference in the function _TIFFmemcmp at tif_unix.c (called from TIFFWriteDirectoryTagTransferfunction) in LibTIFF 4.0.9 allows an attacker to cause a denial-of-service through a crafted tiff file. This vulnerability can be triggered by the executable tiffcp.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libtiff-opengl Ubuntu 18.04.6 LTS (bionic) | 4.0.9-5ubuntu0.2 | [libtiff-opengl 4.0.9-5ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtiff-opengl-4.0.9-5ubuntu0.2.md) | Feb 8, 2019 |
| Linux | libtiff-tools Ubuntu 18.04.6 LTS (bionic) | 4.0.9-5ubuntu0.2 | [libtiff-tools 4.0.9-5ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtiff-tools-4.0.9-5ubuntu0.2.md) | Feb 8, 2019 |
| Linux | libtiff5 Ubuntu 18.04.6 LTS (bionic) | 4.0.9-5ubuntu0.2 | [libtiff5 4.0.9-5ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtiff5-4.0.9-5ubuntu0.2.md) | Feb 8, 2019 |
| Linux | libtiffxx5 Ubuntu 18.04.6 LTS (bionic) | 4.0.9-5ubuntu0.2 | [libtiffxx5 4.0.9-5ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtiffxx5-4.0.9-5ubuntu0.2.md) | Feb 8, 2019 |

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