CVE-2019-17263

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-10-06 · updated 2026-06-17
Weakness: CWE-125

Description

In libyal libfwsi before 20191006, libfwsi_extension_block_copy_from_byte_stream in libfwsi_extension_block.c has a heap-based buffer over-read because rejection of an unsupported size only considers values less than 6, even though values of 6 and 7 are also unsupported. NOTE: the vendor has disputed this as described in the GitHub issue

Affected products

Libfwsi Project Libfwsi: before 20191006 — fixed in 20191006

How to fix

Upgrade to a fixed version: Libfwsi Project Libfwsi 20191006. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/154774/libyal-libfwsi-Buffer-Overread.html
https://github.com/libyal/libfwsi/compare/20181227...20191006
https://github.com/libyal/libfwsi/issues/13
http://packetstormsecurity.com/files/154774/libyal-libfwsi-Buffer-Overread.html
https://github.com/libyal/libfwsi/compare/20181227...20191006
https://github.com/libyal/libfwsi/issues/13

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