#VU31884 Uncontrolled Recursion in re2c - CVE-2018-21232

Vulnerability identifier: #VU31884

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2018-21232

CWE-ID: CWE-674

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
re2c
Other software / Other software solutions

Vendor: www.re2c.org

Description

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

The vulnerability exists due to uncontrolled recursion that causes stack consumption in find_fixed_tags.A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

re2c: 1.0 - 1.3

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External links
http://www.openwall.com/lists/oss-security/2020/05/14/4
http://github.com/skvadrik/re2c/issues/219
http://www.openwall.com/lists/oss-security/2020/04/27/2

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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.