PT-2023-28145 · Shirasagi · Shirasagi

Sim4N6 · Published 2023-09-15 · Updated 2023-09-20 · CVE-2023-41889

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions SHIRASAGI versions prior to 1.18.0

Description The issue is related to a Post-Unicode normalization problem. This occurs when security checks are performed before Unicode normalization, allowing Unicode character equivalents to resurface after normalization.

Recommendations For versions prior to 1.18.0, update to version 1.18.0 to resolve the issue. As a temporary workaround, consider initially performing Unicode normalization, then stripping all whitespaces, and finally checking for a blank string to mitigate the risk of exploitation.

Exploit

Fix

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-116

CWE-176

Related Identifiers

CVE-2023-41889

GHSA-XR45-C2JV-2V9R

Affected Products

Shirasagi

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41889.json · Exploit
• 🔥 https://github.com/shirasagi/shirasagi/security/advisories/GHSA-xr45-c2jv-2v9r · Exploit
• 🔥 https://sim4n6.beehiiv.com/p/unicode-characters-bypass-security-checks · Exploit
• https://osv.dev/vulnerability/CVE-2023-41889 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-41889 · Security Note
• https://github.com/shirasagi/shirasagi/blob/f249ce3f06f6bfbc0017b38f5c13de424334c3ea/app/models/concerns/rdf/object.rb#L68-L72 · Note