Vulnerability CVE-2019-6454
Published: 2019-03-21

Description:
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).

Type:

CWE-119

 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Redhat -> Enterprise linux desktop 
Redhat -> Enterprise linux server 
Redhat -> Enterprise linux server aus 
Redhat -> Enterprise linux server eus 
Redhat -> Enterprise linux server tus 
Redhat -> Enterprise linux workstation 
Opensuse -> LEAP 
Netapp -> Active iq performance analytics services 
Freedesktop -> Systemd 
Fedoraproject -> Fedora 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00070.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
http://www.openwall.com/lists/oss-security/2019/02/18/3
http://www.openwall.com/lists/oss-security/2019/02/19/1
http://www.securityfocus.com/bid/107081
https://access.redhat.com/errata/RHSA-2019:0368
https://access.redhat.com/errata/RHSA-2019:0990
https://access.redhat.com/errata/RHSA-2019:1322
https://github.com/systemd/systemd/commits/master/src/libsystemd/sd-bus/bus-objects.c
https://kc.mcafee.com/corporate/index?page=content&id=SB10278
https://lists.debian.org/debian-lts-announce/2019/02/msg00031.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N67IOBOTDOMVNQJ5QRU2MXLEECXPGNVJ/
https://security.netapp.com/advisory/ntap-20190327-0004/
https://usn.ubuntu.com/3891-1/
https://www.debian.org/security/2019/dsa-4393
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