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InetUtils TFTP Client DNS Resolving Buffer Overflows
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SUMMARY
<http://www.gnu.org/software/inetutils/inetutils.html> InetUtils is "a
collection of common network programs, among other TFTP". Untrusted data
from DNS resolved hostname is copied into finite static buffers without
any bounds checking. We can overflow several buffers located in the .bss.
Also located in the .bss are function pointers used to implement FTP
commands, so exploitation with code execution is possible.
DETAILS
Vulnerable Systems:
* InetUtils version 1.4.2 and prior
The overflows all occur thanks to gethostbyname() returned data. Instead
of copying that data using the length of the destination buffer, the
length of the source buffer is used instead, or no length at all in the
case of strcpy(). An attacker could configure their DNS server
maliciously, or a local attacker on a LAN could spoof replies to neighbors
to exploit this.
main.c:227: bcopy(host->h_addr, &peeraddr.sin_addr, host->h_length);
main.c:228: strcpy(hostname, host->h_name);
main.c:366: bcopy(hp->h_addr, (caddr_t)&peeraddr.sin_addr, hp->h_length);
main.c:369: strcpy(hostname, hp->h_name);
main.c-457: bcopy(hp->h_addr, (caddr_t)&peeraddr.sin_addr, hp->h_length);
main.c:461: strcpy(hostname, hp->h_name);
ADDITIONAL INFORMATION
The information has been provided by <mailto:infamous41md@hotpop.com>
sean.
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