Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2018-15853

Uncontrolled Resource Consumption

Published: Aug 25, 2018 | Modified: Nov 21, 2024
CVSS 3.x
5.5
MEDIUM
Source:
NVD
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
2.1 LOW
AV:L/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
3.3 LOW
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2018-15853
CWEhttps://cwe.mitre.org/data/definitions/400.html

Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon before 0.8.1, which could be used by local attackers to crash xkbcommon users by supplying a crafted keymap file that triggers boolean negation.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
LibxkbcommonXkbcommon*0.8.1 (excluding)
XkbcommonXkbcommon*0.8.1 (excluding)
Red Hat Enterprise Linux 7RedHatgdm-1:3.28.2-16.el7*
Red Hat Enterprise Linux 7RedHatlibX11-0:1.6.7-2.el7*
Red Hat Enterprise Linux 7RedHatlibxkbcommon-0:0.7.1-3.el7*
Red Hat Enterprise Linux 7RedHatmesa-libGLw-0:8.0.0-5.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-drv-ati-0:19.0.1-2.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-drv-vesa-0:2.4.0-3.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-drv-wacom-0:0.36.1-3.el7*
Red Hat Enterprise Linux 7RedHatxorg-x11-server-0:1.20.4-7.el7*
LibxkbcommonUbuntubionic*
LibxkbcommonUbuntuesm-infra/bionic*
LibxkbcommonUbuntuesm-infra/xenial*
LibxkbcommonUbuntutrusty*
LibxkbcommonUbuntuupstream*
LibxkbcommonUbuntuxenial*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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