Out-of-bounds Write Affecting libonig package, versions <6.3.0-1


medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.19% (57th percentile)
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NVD
9.8 critical
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Red Hat
5.9 medium

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  • Snyk ID SNYK-UBUNTU1804-LIBONIG-282506
  • published 24 May 2017
  • disclosed 24 May 2017

How to fix?

Upgrade Ubuntu:18.04 libonig to version 6.3.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libonig package and not the libonig package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.