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CVE-2019-9853

Published: 27 September 2019

LibreOffice documents can contain macros. The execution of those macros is controlled by the document security settings, typically execution of macros are blocked by default. A URL decoding flaw existed in how the urls to the macros within the document were processed and categorized, resulting in the possibility to construct a document where macro execution bypassed the security settings. The documents were correctly detected as containing macros, and prompted the user to their existence within the documents, but macros within the document were subsequently not controlled by the security settings allowing arbitrary macro execution This issue affects: LibreOffice 6.2 series versions prior to 6.2.7; LibreOffice 6.3 series versions prior to 6.3.1.

Notes

AuthorNote
mdeslaur
The fix for this issue was included as part of USN-4102-1

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
libreoffice
Launchpad, Ubuntu, Debian
bionic
Released (1:6.0.7-0ubuntu0.18.04.9)
disco
Released (1:6.2.6-0ubuntu0.19.04.1)
trusty Does not exist

upstream
Released (1:6.3.0-1)
xenial
Released (1:5.1.6~rc2-0ubuntu1~xenial9)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H