Red Hat Bugzilla – Bug 21373
libpcap buffer overflow
Last modified: 2008-05-01 11:37:59 EDT
Libpcap has a buffer overflow. Libpcap uses strcpy to copy a
device (interface-name) to ifreq.ifr_name (16-byte buffer).
The buffer can be overflowed if the program using libpcap passes
userdefined 'device' to pcap_open_live.
Test: tcpdump -i `perl -e "print 'A'x1000"`
This is not big problem unless someone has made a setuid libpcap program.
I'm attaching a patch that seems to fix this.
(Also it looks like might pcap-dlpi.c suffers from similar problem).
Created attachment 5731 [details]
Patch to fix libpcap strcpy(ifr.ifr_name, device) overflow