CVE-2020-17354

Summary

LilyPond before 2.24 allows attackers to bypass the -dsafe protection mechanism via output-def-lookup or output-def-scope, as demonstrated by dangerous Scheme code in a .ly file that causes arbitrary code execution during conversion to a different file format. NOTE: in 2.24 and later versions, safe mode is removed, and the product no longer tries to block code execution when external files are used.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CVE Program Container

Additional References

• http://lilypond.org/doc/v2.18/Documentation/usage/command_002dline-usage
• https://phabricator.wikimedia.org/T259210
• https://www.mediawiki.org/wiki/Extension:Score/2021_security_advisory
• https://tracker.debian.org/news/1249694/accepted-lilypond-2221-1-source-into-unstable/
• https://gitlab.com/lilypond/lilypond/-/merge_requests/1522
• https://lilypond.org/download.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ST5BLLQ4GDME3SN7UE5OMNE5GZE66X4Y/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K43PF6VGFJNNGAPY57BW3VMEFFOSMRLF/

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

References

• http://lilypond.org/doc/v2.18/Documentation/usage/command_002dline-usage
• https://phabricator.wikimedia.org/T259210
• https://www.mediawiki.org/wiki/Extension:Score/2021_security_advisory
• https://tracker.debian.org/news/1249694/accepted-lilypond-2221-1-source-into-unstable/
• https://gitlab.com/lilypond/lilypond/-/merge_requests/1522
• https://lilypond.org/download.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ST5BLLQ4GDME3SN7UE5OMNE5GZE66X4Y/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K43PF6VGFJNNGAPY57BW3VMEFFOSMRLF/

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