#VU19365 Buffer Over-read in Tcpdump - CVE-2019-1010220

Vulnerability identifier: #VU19365

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-1010220

CWE-ID: CWE-126

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tcpdump
Server applications / DLP, anti-spam, sniffers

Vendor: Tcpdump.org

Description

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

The vulnerability exists due to buffer over-read issue in the "print_prefix" function in "print-hncp.c" file via the "ND_PRINT((ndo, "%s", buf));" commponent. A remote attacker can trick a victim to open a specially crafted pcap file, trigger a buffer over-read condition and cause the affected application to crash.

Mitigation
Install update from vendor's website/

Vulnerable software versions

Tcpdump: 4.9.0 - 4.9.2

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External links
https://github.com/the-tcpdump-group/tcpdump/blob/master/print-hncp.c
https://github.com/the-tcpdump-group/tcpdump/blob/tcpdump-4.9.2/print-hncp.c
https://github.com/the-tcpdump-group/tcpdump/commits/master/print-hncp.c
https://github.com/the-tcpdump-group/tcpdump/blob/tcpdump-4.9/CHANGES

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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.