SB2020081716 - Ubuntu update for libonig

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2019-16163)

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

Oniguruma before 6.9.3 allows Stack Exhaustion in regcomp.c because of recursion in regparse.c.

2) Integer overflow (CVE-ID: CVE-2019-19012)

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to integer overflow in the "search_in_range" function in "regexec.c". A remote attacker can use a specially crafted regular expression, trigger out-of-bounds read and cause a denial-of-service or information disclosure on the target system.

3) Buffer Over-read (CVE-ID: CVE-2019-19204)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists in the "fetch_interval_quantifier" function (formerly known as fetch_range_quantifier) in "regparse.c" file due to the PFETCH is called without checking PEND. A remote attacker can cause a denial of service condition on the target system.

4) Out-of-bounds read (CVE-ID: CVE-2019-19246)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to heap-based buffer over-read in str_lower_case_match in regexec.c, if used with PPH 7.3. A remote attacker can perform a denial of service attack or gain access to sensitive information.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-4460-1