# CVE-2018-18520: elfutils: An Invalid Memory Address Dereference exists in the function elf_end in libelf in elfutils through v0.174

CVE-2018-18520 is fixed in 4 products on 1 platform, first by elfutils 0.170-0.4ubuntu0.1, released February 8, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-18520
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0279
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2018

## Description

An Invalid Memory Address Dereference exists in the function elf_end in libelf in elfutils through v0.174. Although eu-size is intended to support ar files inside ar files, handle_ar in size.c closes the outer ar file before handling all inner entries. The vulnerability allows attackers to cause a denial of service (application crash) with a crafted ELF file.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | elfutils Ubuntu 18.04.6 LTS (bionic) | 0.170-0.4ubuntu0.1 | [elfutils 0.170-0.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-elfutils-0.170-0.4ubuntu0.1.md) | Feb 8, 2019 |
| Linux | libasm1 Ubuntu 18.04.6 LTS (bionic) | 0.170-0.4ubuntu0.1 | [libasm1 0.170-0.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libasm1-0.170-0.4ubuntu0.1.md) | Feb 8, 2019 |
| Linux | libdw1 Ubuntu 18.04.6 LTS (bionic) | 0.170-0.4ubuntu0.1 | [libdw1 0.170-0.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libdw1-0.170-0.4ubuntu0.1.md) | Feb 8, 2019 |
| Linux | libelf1 Ubuntu 18.04.6 LTS (bionic) | 0.170-0.4ubuntu0.1 | [libelf1 0.170-0.4ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libelf1-0.170-0.4ubuntu0.1.md) | Feb 8, 2019 |

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