--- title: "CVE-2017-18199\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2017-18199?format=md keywords: index, follow --- # CVE-2017-18199 Publication date 24 February 2018 Last updated 25 August 2025 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **6.5 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2017-18199?format=md#impact-score) Toggle side navigation ## Description realloc\_symlink in rock.c in GNU libcdio before 1.0.0 allows remote attackers to cause a denial of service (NULL Pointer Dereference) via a crafted iso file. [Read the notes from the security team](https://ubuntu.com/security/CVE-2017-18199?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | libcdio | 22.10 kinetic | Not affected | | 22.04 LTS jammy | Not affected | | 21.10 impish | Not affected | | 21.04 hirsute | Not affected | | 20.10 groovy | Not affected | | 20.04 LTS focal | Not affected | | 19.10 eoan | Not affected | | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Not affected | | 17.10 artful | Ignored end of life | | 16.04 LTS xenial | Fixed 0.83-4.2ubuntu1+esm1 Ubuntu Pro | | 14.04 LTS trusty | Fixed 0.83-4.1ubuntu1+esm1 Ubuntu Pro | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2017-18199?format=md#patch-details) ### Get expanded security coverage with Ubuntu Pro Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use. [Get Ubuntu Pro](https://ubuntu.com/pro) [30-day free trial](https://ubuntu.com/pro/free-trial) ## Notes --- ### [ccdm94](https://launchpad.net/~ccdm94) there is no explicit information mentioning what is the patch for this CVE, but it looks like it might have been fixed together with other issues in commit b9ab2a9d36a, according to the comment in the NEWS file. This is the commit that patches CVE-2017-18198. No other changes made to the to the code seem to be related to this vulnerability other than e73a8bb23a4, which looks like an initial version of something improved by commit b9ab2a9d36a. Commit e73a8bb23a4 fixes issue 52091 which is very similar to the issue that is CVE-2017-18198. CVE-2017-18199 involves code that is closely related to the code that is affected by CVE-2017-18198, and further research indicates that the POC for this latter CVE no longer causes a crash when commit e73a8bb23a4 is applied, so it is adequate to assume that it fixes CVE-2017-18199 and that commit b9ab2a9d36a, the improved version of e73a8bb23a4, does so as well. ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | libcdio | * Upstream: [?id=e73](https://git.savannah.gnu.org/cgit/libcdio.git/commit/?id=e73a8bb23a4405b32cc7708771833f6c4e6b2426) * Upstream: [?id=b9a](https://git.savannah.gnu.org/cgit/libcdio.git/commit/?id=b9ab2a9d36a216ba1b3a6b4ee465c3ee2b806ec6) | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 6.5 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | Required | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 6.5 · Medium | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18199) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-18199) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-18199) * [Debian](https://security-tracker.debian.org/tracker/CVE-2017-18199) ### Related Ubuntu Security Notices (USN) + [USN-5558-1](https://usn.ubuntu.com/USN-5558-1) + libcdio vulnerabilities + 10 August 2022 ### Other references * * *