A libonig security update has been released for Debian GNU/Linux 7 Extended LTS to address several vulnerabilities

ELA-198-1 libonig security update

Package libonig
Version 5.9.1-1+deb7u4
Related CVE CVE-2019-19012 CVE-2019-19204 CVE-2019-19246

Several vulnerabilities were discovered in the Oniguruma regular expressions library, notably used in PHP mbstring.

CVE-2019-19012

An integer overflow in the search_in_range function in regexec.c leads to an out-of-bounds read, in which the offset of this read is under the control of an attacker. (This only affects the 32-bit compiled version). Remote attackers can cause a denial-of-service or information disclosure, or possibly have unspecified other impact, via a crafted regular expression.

CVE-2019-19204

In the function fetch_range_quantifier in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read and lead to denial-of-service via a crafted regular expression.

CVE-2019-19246

Heap-based buffer over-read in str_lower_case_match in regexec.c can lead to denial-of-service via a crafted regular expression.

For Debian 7 Wheezy, these problems have been fixed in version 5.9.1-1+deb7u4.

We recommend that you upgrade your libonig packages.

Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/