SB2017021628 - Multiple vulnerabilities in PCRE

Description

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2017-6004)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to a boundary condition within the compile_bracket_matchingpath() function in pcre_jit_compile.c. A remote attacker can pass a specially crafted regular expression to the application, trigger an out-of-bounds read and perform a denial of service (DoS) attack.

2) Out-of-bounds read (CVE-ID: CVE-2017-7186)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to a segmentation violation issue by the libpcre1 and libpcre2. A remote attacker can send specially crafted packets and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Remediation

Install update from vendor's website.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1425365
• https://blogs.gentoo.org/ago/2017/03/20/libpcre-invalid-memory-read-in-_pcre32_xclass-pcre_xclass-c/