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AUSCERT External Security Bulletin Redistribution
libonig security update
5 December 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2019-19246 CVE-2019-19204 CVE-2019-19012
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running libonig check for an updated version of the software for
their operating system.
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Package : libonig
Version : 5.9.5-3.2+deb8u4
CVE ID : CVE-2019-19012 CVE-2019-19204 CVE-2019-19246
Debian Bug : 944959 945313
Several vulnerabilities were discovered in the Oniguruma regular
expressions library, notably used in PHP mbstring.
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.
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
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
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: https://wiki.debian.org/LTS
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