Debian LTS: Security Advisory for libonig (DLA-2431-1)

The remote host is missing an update for the 'libonig' package(s) announced via the DLA-2431-1 advisory.

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

'libonig' package(s) on Debian Linux.

Checks if a vulnerable package version is present on the target host.

For Debian 9 stretch, these problems have been fixed in version 6.1.3-2+deb9u1. We recommend that you upgrade your libonig packages.