#VU39076 Heap-based buffer overflow in PCRE2 - CVE-2017-8786

Vulnerability identifier: #VU39076

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-8786

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PCRE2
Universal components / Libraries / Libraries used by multiple products

Vendor: PCRE

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in pcre2test.c in PCRE2 10.23. A remote attacker can use a crafted regular expression. to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PCRE2: 10.23

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External links
https://blogs.gentoo.org/ago/2017/04/29/libpcre-heap-based-buffer-overflow-write-in-pcre2test-c/
https://bugs.exim.org/show_bug.cgi?id=2079
https://security.gentoo.org/glsa/201710-09
https://vcs.pcre.org/pcre2?view=revision&revision=696
https://vcs.pcre.org/pcre2?view=revision&revision=697

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.