Описание
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
An out-of-bounds read vulnerability was found in the way Oniguruma handled regular expressions with GB18030 character encoding. A UChar pointer is dereferenced without checking if it passed the end of the matched string, leading to a heap-based buffer over-read. A remote attacker could abuse this flaw by providing a malformed regular expression that, when processed by an application linked to Oniguruma, might crash the application causing a denial of service.
Отчет
This flaw did not affect the versions of Oniguruma (embedded in php) as shipped with Red Hat Enterprise Linux 5, as they did not include support for GB18030 character encoding, which was introduced in a later version of the library. The versions of Ruby as shipped with Red Hat Enterprise Linux and Red Hat Software Collections 3 do not use Oniguruma but rather Onigmo, a regular expressions library forked from Oniguruma focusing on new expressions supported in Perl 5.10+. Those versions are affected by this flaw because both Onigmo and Oniguruma share the same vulnerable code. However, Ruby does perform additional checks which prevent the vulnerable code path to be easily reached, hence lowering the severity of the flaw.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | php | Not affected | ||
| Red Hat Enterprise Linux 5 | php53 | Out of support scope | ||
| Red Hat Enterprise Linux 6 | oniguruma | Out of support scope | ||
| Red Hat Enterprise Linux 6 | php | Out of support scope | ||
| Red Hat Enterprise Linux 7 | php | Will not fix | ||
| Red Hat Enterprise Linux 7 | ruby | Fix deferred | ||
| Red Hat Enterprise Linux 8 | php:7.2/php | Will not fix | ||
| Red Hat Enterprise Linux 8 | ruby:2.5/ruby | Fix deferred | ||
| Red Hat Enterprise Linux 8 | ruby:2.6/ruby | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | oniguruma | Will not fix |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the func ...
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
Уязвимость функции gb18030_mbc_enc_len библиотеки регулярных выражений Oniguruma, связанная с чтением за допустимыми границами буфера данных, позволяющая нарушителю вызвать отказ в обслуживании
EPSS
7.5 High
CVSS3