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Multiple Vulnerabilities in tcpdump

A Debian security update for tcpdump 32 different vulnerabilities in tcpdump that are addressed by this update [1]. While there are not a lot of details available yet, some of the vulnerabilities can apparently be used to execute arbitrary code. 

This is in particular worrying if you use tcpdump to look at live attack traffic. Of course, remember that you can have tcpdump relinquish its root privileges after you start it up (-Z userid) , but it would still have the ability to execute code as the user running tcpdump.

All tcpdump versions prior to 4.9.0 may be vulnerable. (again, not a lot of details yet). Based on a quick look at the vulnerabliity summaries below, it looks like various "print" functions are affected. These functions should not be called if you just write a packets to a file using the "-w" option in tcpdump. So the best way to run tcpdump until you are patched:

tcpdump -Z nobody -w filename ...[other options]...

("nobody" may not be the best choice for your platform. Pick a low privilege user that works for you)

 

CVE Number Description
CVE-2016-7922 The AH parser in tcpdump before 4.9.0 has a buffer overflow in print-ah.c:ah_print().
CVE-2016-7923 The ARP parser in tcpdump before 4.9.0 has a buffer overflow in print-arp.c:arp_print().
CVE-2016-7924 The ATM parser in tcpdump before 4.9.0 has a buffer overflow in print-atm.c:oam_print().
CVE-2016-7925 The compressed SLIP parser in tcpdump before 4.9.0 has a buffer overflow in print-sl.c:sl_if_print().
CVE-2016-7926 The Ethernet parser in tcpdump before 4.9.0 has a buffer overflow in print-ether.c:ethertype_print().
CVE-2016-7927 The IEEE 802.11 parser in tcpdump before 4.9.0 has a buffer overflow in print-802_11.c:ieee802_11_radio_print().
CVE-2016-7928 The IPComp parser in tcpdump before 4.9.0 has a buffer overflow in print-ipcomp.c:ipcomp_print().
CVE-2016-7929 The Juniper PPPoE ATM parser in tcpdump before 4.9.0 has a buffer overflow in print-juniper.c:juniper_parse_header().
CVE-2016-7930 The LLC/SNAP parser in tcpdump before 4.9.0 has a buffer overflow in print-llc.c:llc_print().
CVE-2016-7931 The MPLS parser in tcpdump before 4.9.0 has a buffer overflow in print-mpls.c:mpls_print().
CVE-2016-7932 The PIM parser in tcpdump before 4.9.0 has a buffer overflow in print-pim.c:pimv2_check_checksum().
CVE-2016-7933 The PPP parser in tcpdump before 4.9.0 has a buffer overflow in print-ppp.c:ppp_hdlc_if_print().
CVE-2016-7934 The RTCP parser in tcpdump before 4.9.0 has a buffer overflow in print-udp.c:rtcp_print().
CVE-2016-7935 The RTP parser in tcpdump before 4.9.0 has a buffer overflow in print-udp.c:rtp_print()
CVE-2016-7936 The UDP parser in tcpdump before 4.9.0 has a buffer overflow in print-udp.c:udp_print().
CVE-2016-7937 The VAT parser in tcpdump before 4.9.0 has a buffer overflow in print-udp.c:vat_print().
CVE-2016-7938 The ZeroMQ parser in tcpdump before 4.9.0 has an integer overflow in print-zeromq.c:zmtp1_print_frame().
CVE-2016-7939 The GRE parser in tcpdump before 4.9.0 has a buffer overflow in print-gre.c, multiple functions.
CVE-2016-7940 The STP parser in tcpdump before 4.9.0 has a buffer overflow in print-stp.c, multiple functions.
CVE-2016-7973 The AppleTalk parser in tcpdump before 4.9.0 has a buffer overflow in print-atalk.c, multiple functions.
CVE-2016-7974 The IP parser in tcpdump before 4.9.0 has a buffer overflow in print-ip.c, multiple functions.
CVE-2016-7975 The TCP parser in tcpdump before 4.9.0 has a buffer overflow in print-tcp.c:tcp_print().
CVE-2016-7983 The BOOTP parser in tcpdump before 4.9.0 has a buffer overflow in print-bootp.c:bootp_print().
CVE-2016-7984 The TFTP parser in tcpdump before 4.9.0 has a buffer overflow in print-tftp.c:tftp_print().
CVE-2016-7985 The CALM FAST parser in tcpdump before 4.9.0 has a buffer overflow in print-calm-fast.c:calm_fast_print().
CVE-2016-7986 The GeoNetworking parser in tcpdump before 4.9.0 has a buffer overflow in print-geonet.c, multiple functions.
CVE-2016-7992 The Classical IP over ATM parser in tcpdump before 4.9.0 has a buffer overflow in print-cip.c:cip_if_print().
CVE-2016-7993 A bug in util-print.c:relts_print() in tcpdump before 4.9.0 could cause a buffer overflow in multiple protocol parsers (DNS, DVMRP, HSRP, IGMP, lightweight resolver protocol, PIM).
CVE-2016-8574 The FRF.15 parser in tcpdump before 4.9.0 has a buffer overflow in print-fr.c:frf15_print().
CVE-2016-8575 The Q.933 parser in tcpdump before 4.9.0 has a buffer overflow in print-fr.c:q933_print(), a different vulnerability than CVE-2017-5482.
CVE-2017-5202 The ISO CLNS parser in tcpdump before 4.9.0 has a buffer overflow in print-isoclns.c:clnp_print().
CVE-2017-5203 The BOOTP parser in tcpdump before 4.9.0 has a buffer overflow in print-bootp.c:bootp_print().
CVE-2017-5204 The IPv6 parser in tcpdump before 4.9.0 has a buffer overflow in print-ip6.c:ip6_print().
CVE-2017-5205 The ISAKMP parser in tcpdump before 4.9.0 has a buffer overflow in print-isakmp.c:ikev2_e_print().
CVE-2017-5341 The OTV parser in tcpdump before 4.9.0 has a buffer overflow in print-otv.c:otv_print().
CVE-2017-5342 In tcpdump before 4.9.0, a bug in multiple protocol parsers (Geneve, GRE, NSH, OTV, VXLAN and VXLAN GPE) could cause a buffer overflow in print-ether.c:ether_print().
CVE-2017-5482 The Q.933 parser in tcpdump before 4.9.0 has a buffer overflow in print-fr.c:q933_print(), a different vulnerability than CVE-2016-8575.
CVE-2017-5483 The SNMP parser in tcpdump before 4.9.0 has a buffer overflow in print-snmp.c:asn1_parse()
CVE-2017-5484 The ATM parser in tcpdump before 4.9.0 has a buffer overflow in print-atm.c:sig_print().
CVE-2017-5485 The ISO CLNS parser in tcpdump before 4.9.0 has a buffer overflow in addrtoname.c:lookup_nsap().
CVE-2017-5486 The ISO CLNS parser in tcpdump before 4.9.0 has a buffer overflow in print-isoclns.c:clnp_print().

[1] https://www.debian.org/security/2017/dsa-3775

 

UPDATE RW: tcpdump 4.9.0 has been released to address these vulnerabilities

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Johannes B. Ullrich, Ph.D.
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Johannes

3086 Posts
ISC Handler

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