Debian Security Advisory

DLA-2020-1 libonig -- LTS security update

Date Reported:
04 Dec 2019
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 944959, Bug 945313.
In Mitre's CVE dictionary: CVE-2019-19012, CVE-2019-19204, CVE-2019-19246.
More information:

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 8 Jessie, these problems have been fixed in version 5.9.5-3.2+deb8u4.

We recommend that you upgrade your libonig packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: