cve/2017/CVE-2017-9225.md

CVE-2017-9225

Description

An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds write in onigenc_unicode_get_case_fold_codes_by_str() occurs during regular expression compilation. Code point 0xFFFFFFFF is not properly handled in unicode_unfold_key(). A malformed regular expression could result in 4 bytes being written off the end of a stack buffer of expand_case_fold_string() during the call to onigenc_unicode_get_case_fold_codes_by_str(), a typical stack buffer overflow.

POC

Reference

No PoCs from references.

Github

• https://github.com/balabit-deps/balabit-os-7-libonig
• https://github.com/balabit-deps/balabit-os-8-libonig
• https://github.com/onivim/esy-oniguruma