CVE-2021-25634

NameCVE-2021-25634
DescriptionLibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to modify a digitally signed ODF document to insert an additional signing time timestamp which LibreOffice would incorrectly present as a valid signature signed at the bogus signing time. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4988-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libreoffice (PTS)stretch (security), stretch1:5.2.7-1+deb9u11fixed
buster1:6.1.5-3+deb10u7vulnerable
buster (security)1:6.1.5-3+deb10u4vulnerable
bullseye1:7.0.4-4vulnerable
bullseye (security)1:7.0.4-4+deb11u1fixed
bookworm1:7.2.2-1fixed
sid1:7.2.3-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libreofficesourcestretch(not affected)
libreofficesourcebullseye1:7.0.4-4+deb11u1DSA-4988-1
libreofficesource(unstable)1:7.2.0-2

Notes

[buster] - libreoffice <ignored> (Risk doesn't warrant complex backport)
[stretch] - libreoffice <not-affected> (XAdES / xades:SigningTime support introduced in 5.3)
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25634
https://www.openwall.com/lists/oss-security/2021/10/11/2
XAdES/xades:SigningTime support introduced in 5.3, but pre-requisite for CVE-2021-25633/25634 also introduces it
Pre-requisites (replacement for XSecParser):
https://github.com/LibreOffice/core/commit/ad5930e87e788780a255523f106deb1dde5d7b37 (7-0)
https://github.com/LibreOffice/core/commit/d92235df75829a8cf2ee8cc7b0b76063093b6cc2 (7-1)
Fixed by: https://github.com/LibreOffice/core/commit/abe77c4fcb9ea97d9fff07eaea6d8863bcba5b02 (7-0)
Fixed by: https://github.com/LibreOffice/core/commit/94ce59dd02fcfcaa1eb4f195b45a9a2edbd58242 (7-0)
Fixed by: https://github.com/LibreOffice/core/commit/89befefb98487a27bff1003084e1200320828b3f (7-1)
Fixed by: https://github.com/LibreOffice/core/commit/b776cf1281660cf495e12824872576bb8e99d569 (7-1)

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