CVE-2018-15687: systemd: chown_one() can dereference symlinks
First published: Fri Oct 26 2018(Updated: )
A race condition in chown_one() of systemd allows an attacker to cause systemd to set arbitrary permissions on arbitrary files. Affected releases are systemd versions up to and including 239.
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =18.10 | |
| Systemd Project Systemd | >=235<240 | |
| debian/systemd | 247.3-7+deb11u5 247.3-7+deb11u6 252.30-1~deb12u2 256.6-1 256.7-1 |
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Reference Links
- http://www.securityfocus.com/bid/105748
- https://github.com/systemd/systemd/pull/10517/commits
- https://security.gentoo.org/glsa/201810-10
- https://usn.ubuntu.com/3816-1/
- https://www.exploit-db.com/exploits/45715/
- https://launchpad.net/bugs/cve/CVE-2018-15687
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1689
- https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1796692
- https://github.com/systemd/systemd/pull/10517
- https://security-tracker.debian.org/tracker/CVE-2018-15687
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15687
- https://nvd.nist.gov/vuln/detail/CVE-2018-15687
- https://ubuntu.com/security/CVE-2018-15687
Frequently Asked Questions
What is CVE-2018-15687?
CVE-2018-15687 is a race condition vulnerability in chown_one() of systemd that allows an attacker to set arbitrary permissions on arbitrary files.
Which versions of systemd are affected by CVE-2018-15687?
Affected releases are systemd versions up to and including 239.
What is the severity of CVE-2018-15687?
CVE-2018-15687 has a severity rating of high.
How can I fix CVE-2018-15687 in Ubuntu 16.04 LTS?
To fix CVE-2018-15687 in Ubuntu 16.04 LTS, update the systemd package to version 229-4ubuntu21.8 or higher.
Where can I find more information about CVE-2018-15687?
More information about CVE-2018-15687 can be found at the following references: [CVE-2018-15687](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15687), [Ubuntu Security Notice USN-3816-1](https://ubuntu.com/security/notices/USN-3816-1), [NVD CVE-2018-15687](https://nvd.nist.gov/vuln/detail/CVE-2018-15687).
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