CVE-2018-15686: systemd: reexec state injection: fgets() on overlong lines leads to line splitting
First published: Mon Oct 15 2018(Updated: )
A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This can be used to improperly influence systemd execution and possibly lead to root privilege escalation. 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 | |
| Debian Debian Linux | =8.0 | |
| Systemd Project Systemd | <=239 | |
| Oracle Communications Cloud Native Core Network Function Cloud Native Environment | =1.4.0 | |
| 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/105747
- https://access.redhat.com/errata/RHSA-2019:2091
- https://access.redhat.com/errata/RHSA-2019:3222
- https://access.redhat.com/errata/RHSA-2020:0593
- https://github.com/systemd/systemd/pull/10519
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0@%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2018/11/msg00017.html
- https://security.gentoo.org/glsa/201810-10
- https://usn.ubuntu.com/3816-1/
- https://www.exploit-db.com/exploits/45714/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://launchpad.net/bugs/cve/CVE-2018-15686
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1643372
- https://github.com/systemd/systemd/commit/9f1c81d80a435d15ca1bd536a6d043c18c81c047
- https://access.redhat.com/security/cve/cve-2018-15686
- https://access.redhat.com/errata/RHSA-2020:1264
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1681334&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1681334&action=edit
- https://bugzilla.redhat.com/show_bug.cgi?id=1639071
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1687
- https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1796402
- https://security-tracker.debian.org/tracker/CVE-2018-15686
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15686
- https://nvd.nist.gov/vuln/detail/CVE-2018-15686
- https://ubuntu.com/security/CVE-2018-15686
Frequently Asked Questions
What is the severity of CVE-2018-15686?
The severity of CVE-2018-15686 is high.
What is the vulnerability description of CVE-2018-15686?
CVE-2018-15686 is a vulnerability in unit_deserialize of systemd that allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess, possibly leading to root privilege escalation.
Which releases of systemd are affected by CVE-2018-15686?
Affected releases are systemd versions up to and including 229-4ubuntu21.8, 237-3ubuntu10.6, 239-7ubuntu10.3, and all versions listed for Debian.
How can I fix CVE-2018-15686?
To fix CVE-2018-15686, you should update systemd to version 229-4ubuntu21.9 or later for Ubuntu, and follow the recommended updates for Debian.
Where can I find more information about CVE-2018-15686?
You can find more information about CVE-2018-15686 on the MITRE CVE website, Ubuntu Security Notices, and NIST National Vulnerability Database.
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