#VU39201 Infinite loop in Wireshark - CVE-2017-7745

Vulnerability identifier: #VU39201

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-2017-7745

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Wireshark
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Wireshark.org

Description

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

In Wireshark 2.2.0 to 2.2.5 and 2.0.0 to 2.0.11, the SIGCOMP dissector could go into an infinite loop, triggered by packet injection or a malformed capture file. This was addressed in epan/dissectors/packet-sigcomp.c by correcting a memory-size check.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Wireshark: 2.0.0 - 2.0.11, 2.2.0 - 2.2.5

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External links
https://www.securityfocus.com/bid/97627
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13578
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=acd8e1a9b17ad274bea1e01e10e4481508a1cbf0
https://www.wireshark.org/security/wnpa-sec-2017-20.html

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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.