[Secure-testing-team] Bug#863313: libonig: CVE-2017-9225

[Salvatore Bonaccorso]

Source: libonig
Version: 6.1.3-1
Severity: important
Tags: patch security upstream
Forwarded: https://github.com/kkos/oniguruma/issues/56

Hi,

the following vulnerability was published for libonig.

CVE-2017-9225[0]:
| 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.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2017-9225
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9225
[1] https://github.com/kkos/oniguruma/issues/56
[2] https://github.com/kkos/oniguruma/commit/166a6c3999bf06b4de0ab4ce6b088a468cc4029f

Please adjust the affected versions in the BTS as needed. AFAICT this
only affects the version in stretch and sid, but not older.

Regards,
Salvatore