NetBSD Static ARP Vulnerability
BID:265
Info
NetBSD Static ARP Vulnerability
| Bugtraq ID: | 265 |
| Class: | Failure to Handle Exceptional Conditions |
| CVE: | |
| Remote: | Yes |
| Local: | No |
| Published: | May 21 1999 12:00AM |
| Updated: | May 21 1999 12:00AM |
| Credit: | This vulnerability was discovered by Olaf "Rhialto" Seibert. |
| Vulnerable: |
NetBSD NetBSD 1.3.3 NetBSD NetBSD 1.3.2 NetBSD NetBSD 1.3.1 NetBSD NetBSD 1.3 |
| Not Vulnerable: |
NetBSD NetBSD 1.4 x86 |
Discussion
NetBSD Static ARP Vulnerability
ARP is a protocol used to dynamically obtain Network Layer to Link Layer translation services. Static ARP table entries can be created which map Network Layer to Link Layer address without requiring to dynamicly query the network. These can be used as a security measure, to disallow rogue host on the network segment from responding to ARP queries with fake ARP replies that redirect the traffic away from its legitimate host. NetBSD's implementation of ARP allows ARP replies to overwrite ARP entries marked as static thus voiding their security.
ARP is a protocol used to dynamically obtain Network Layer to Link Layer translation services. Static ARP table entries can be created which map Network Layer to Link Layer address without requiring to dynamicly query the network. These can be used as a security measure, to disallow rogue host on the network segment from responding to ARP queries with fake ARP replies that redirect the traffic away from its legitimate host. NetBSD's implementation of ARP allows ARP replies to overwrite ARP entries marked as static thus voiding their security.
Exploit / POC
NetBSD Static ARP Vulnerability
Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].
Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].
Solution / Fix
NetBSD Static ARP Vulnerability
Solution:
Upgrade to NetBSD-1.4, and NetBSD-1.4_BETA after 1999-05-05.
A patch is available for NetBSD 1.3.3 to fix this problem. You may find this patch on the NetBSD ftp server:
ftp://ftp.NetBSD.ORG/pub/NetBSD/misc/security/patches/19990505-arp
NetBSD-current since 19990506 is not vulnerable. Users of NetBSD-current should upgrade to a source tree later than 19990506.
Solution:
Upgrade to NetBSD-1.4, and NetBSD-1.4_BETA after 1999-05-05.
A patch is available for NetBSD 1.3.3 to fix this problem. You may find this patch on the NetBSD ftp server:
ftp://ftp.NetBSD.ORG/pub/NetBSD/misc/security/patches/19990505-arp
NetBSD-current since 19990506 is not vulnerable. Users of NetBSD-current should upgrade to a source tree later than 19990506.
References
NetBSD Static ARP Vulnerability
References:
References: