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CVE-2019-6454

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Date: March 21, 2019

An issue was discovered in sd-bus in systemd 239. bus_process_object() in libsystemd/sd-bus/bus-objects.c allocates a variable-length stack buffer for temporarily storing the object path of incoming D-Bus messages. An unprivileged local user can exploit this by sending a specially crafted message to PID1, causing the stack pointer to jump over the stack guard pages into an unmapped memory region and trigger a denial of service (systemd PID1 crash and kernel panic).

Language: C

Severity Score

Related Resources (25)

https://access.redhat.com/errata/RHSA-2019:0990
https://security-tracker.debian.org/tracker/CVE-2019-6454
https://kc.mcafee.com/corporate/index?page=content&id=SB10278
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
https://security.netapp.com/advisory/ntap-20190327-0004/
https://access.redhat.com/errata/RHSA-2019:0368
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-6454
https://access.redhat.com/errata/RHSA-2019:1322
http://www.openwall.com/lists/oss-security/2021/07/20/2
https://nvd.nist.gov/vuln/detail/CVE-2019-6454
https://www.debian.org/security/2019/dsa-4393
http://www.securityfocus.com/bid/107081
https://lists.debian.org/debian-lts-announce/2019/02/msg00031.html
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00070.html
http://www.openwall.com/lists/oss-security/2019/02/18/3
https://usn.ubuntu.com/3891-1/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N67IOBOTDOMVNQJ5QRU2MXLEECXPGNVJ/
http://www.openwall.com/lists/oss-security/2019/02/19/1
https://github.com/systemd/systemd/commit/f519a19bcd5afe674a9b8fc462cd77d8bad403c1#diff-88d4b05d65f1377f716024145dc65d16
https://access.redhat.com/errata/RHSA-2019:1502
https://access.redhat.com/security/cve/CVE-2019-6454
https://github.com/systemd/systemd/commits/master/src/libsystemd/sd-bus/bus-objects.c
https://access.redhat.com/errata/RHSA-2019:2805
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6454
https://www.mend.io/vulnerability-database/CVE-2019-6454

Severity Score

Weakness Type (CWE)

Buffer Errors

CWE-119

Out-of-bounds Write

CWE-787

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): COMPLETE
Additional information:

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