Denial of service in tcpdump

1) Buffer Over-read

EUVDB-ID: #VU19365

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1010220

CWE-ID: CWE-126 - Buffer over-read

Exploit availability: No

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

External links

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

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.