CVE-2023-41889

Late-Unicode normalization vulnerability in SHIRASAGI

SHIRASAGI is a Content Management System. Prior to version 1.18.0, SHIRASAGI is vulnerable to a Post-Unicode normalization issue. This happens when a logical validation or a security check is performed before a Unicode normalization. The Unicode character equivalent of a character would resurface after the normalization. The fix is initially performing the Unicode normalization and then strip for all whitespaces and then checking for a blank string. This issue has been fixed in version 1.18.0.

Affected

shirasagi

CVSS v3.1 NVD

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

0.71% chance of exploitation in the next 30 days, 53rd percentile

Published

2023-09-15

Updated

2024-09-25

Proof-of-concept exploits (1)

• shirasagi/shirasagi/security/advisories/GHSA-xr45-c2jv-2v9r

Security advisories

• https://sim4n6.beehiiv.com/p/unicode-characters-bypass-security-checks
• shirasagi/shirasagi/blob/f249ce3f06f6bfbc0017b38f5c13de424334c3ea/app/models/concerns/rdf…

References

• CVE Record
• NVD entry