Vulnerability CVE-2018-15862
Published: 2018-08-25

Description:
Unchecked NULL pointer usage in LookupModMask in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file with invalid virtual modifiers.

Type:

CWE-476

 (NULL Pointer Dereference)

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
2.1/10
2.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Xkbcommon -> Libxkbcommon 
Xkbcommon -> Xkbcommon 
Canonical -> Ubuntu linux 

 References:
https://access.redhat.com/errata/RHSA-2019:2079
https://github.com/xkbcommon/libxkbcommon/commit/4e2ee9c3f6050d773f8bbe05bc0edb17f1ff8371
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html
https://security.gentoo.org/glsa/201810-05
https://usn.ubuntu.com/3786-1/
https://usn.ubuntu.com/3786-2/
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