Title: DProxy DNS_Decode_Reverse_Name Buffer-Overflow Vulnerability
Severity: CRITICAL
Description:
Dproxy is a small, freely available caching DNS server.
The application is prone to a remote buffer-overflow vulnerability because it fails to properly check boundaries on user-supplied data before copying it to an insufficiently sized buffer.
Specifically, the vulnerability affects the 'dns_decode_reverse_name()' function in the 'dns_decode.c' source file. The software fails to check the size of the 'name' parameter before copying it into a temporary fixed-size buffer of 255 bytes. When the application processes a maliciously crafted 'name' parameter value exceeding the temporary buffer size, memory will become corrupted as a result of a buffer overflow.
The 'dns_decode_name()' may also be vulnerable, but this has not been confirmed. This BID will be updated as further information becomes available.
An attacker could exploit this issue to cause denial-of-service conditions or to execute arbitrary machine code with superuser privileges. A successful attack could result in the complete compromise of affected computers or routers/devices.
Version 1.c is vulnerable; other may also be affected.
Affected Products:
- Matthew Pratt dproxy 0.1
- Matthew Pratt dproxy 0.2
- Matthew Pratt dproxy 0.3
- Matthew Pratt dproxy 0.4
- Matthew Pratt dproxy 0.5
- Matthew Pratt dproxy-nexgen 1.c
References:
- Matthew Pratt: dproxy Home Page
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