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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3899
                          libonig security update
                              6 November 2020

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libonig
Publisher:         Debian
Operating System:  Debian GNU/Linux
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-26159 CVE-2019-19246 CVE-2019-19204
                   CVE-2019-19203 CVE-2019-19012 CVE-2019-16163
                   CVE-2019-13224  

Reference:         ESB-2020.3072
                   ESB-2020.2827
                   ESB-2019.4556
                   ESB-2019.3485

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2020/11/msg00006.html

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Debian LTS Advisory DLA-2431-1               debian-lts@lists.debian.org
https://www.debian.org/lts/security/                     Markus Koschany
November 05, 2020                            https://wiki.debian.org/LTS
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Package        : libonig
Version        : 6.1.3-2+deb9u1
CVE ID         : CVE-2019-13224 CVE-2019-16163 CVE-2019-19012
                 CVE-2019-19203 CVE-2019-19204 CVE-2019-19246
                 CVE-2020-26159
Debian Bug     : 931878 939988 944959 945312 945313 946344 972113

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

CVE-2019-13224

   A use-after-free in onig_new_deluxe() in regext.c allows
   attackers to potentially cause information disclosure, denial of
   service, or possibly code execution by providing a crafted regular
   expression. The attacker provides a pair of a regex pattern and a
   string, with a multi-byte encoding that gets handled by
   onig_new_deluxe().

CVE-2019-16163

    Oniguruma allows Stack Exhaustion in regcomp.c because of recursion
    in regparse.c.

CVE-2019-19012

    An integer overflow in the search_in_range function in regexec.c in
    Onigurama 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-2019-19203

    An issue was discovered in Oniguruma. 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.

CVE-2019-19204

    An issue was discovered in Oniguruma. In the function
    fetch_interval_quantifier (formerly known as fetch_range_quantifier)
    in regparse.c, PFETCH is called without checking PEND. This leads to
    a heap-based buffer over-read.

CVE-2019-19246

    Oniguruma has a heap-based buffer over-read in str_lower_case_match
    in regexec.c.

CVE-2020-26159

    In Oniguruma an attacker able to supply a regular expression for
    compilation may be able to overflow a buffer by one byte in
    concat_opt_exact_str in src/regcomp.c

For Debian 9 stretch, these problems have been fixed in version
6.1.3-2+deb9u1.

We recommend that you upgrade your libonig packages.

For the detailed security status of libonig please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libonig

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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