CVE-2019-9853 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00040.html http://packetstormsecurity.com/files/156474/Open-Xchange-App-Suite-Documents-Server-Side-Request-Forgery.html http://seclists.org/fulldisclosure/2020/Feb/23 https://lists.apache.org/thread.html/19c917f7c8a0d8f62142046fabfe3e2c7d6091ef1f92b99c6e79e24e@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/27339e8a9a1e9bb47fbdb939b338256d0356250a1974aaf4d774f683@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/306a374361891eb17c6cffc99c3d7be1d3152a99c839d4231edc1631@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/3a5570ca5cd14ad08e24684c71cfeff3a507f108fe3cf30ba4f58226@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/4ae0e6e52600f408d943ded079d314733ce188b04b04471464f89c4f@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/70da9481dca267405e1d79e53942264765ef3f55c9a563c3737e3926@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/7394e6b5f78a878bd0c44e9bc9adf90b8cdf49e9adc0f287145aba9b@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/9dc85d9937ad7f101047c53f78c00e8ceb135eaeff7dcf4724b46f2c@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/a5231ad45b030b54828c7b0b62a7e7d4b48481c7cb83ff628e07fa43@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/a540d1b6f9a7ebb206adba02839f654a6ee63a7b0976f559a847e49a@3Ccommits.openoffice.apache.org3E https://lists.apache.org/thread.html/ca216900abd846f0220fe18b95f9f787bdbe0e87fa4eee822073cd69@3Ccommits.openoffice.apache.org3E https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQGBRSD73KTDZ2MPAOL7FBWO3SQVYE5B/ https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9853/ 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.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8