Sun(sm) Alert Notification
* Sun Alert ID: 102667
* Synopsis: Security Vulnerability in the Solaris 10 TCP Fusion Code
May Lead to a System Panic, Resulting in a Denial of Service (DoS)
* Category: Security
* Product: Solaris 10 Operating System
* BugIDs: 6348581
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 17-Oct-2006
* Date Closed: 17-Oct-2006
* Date Modified:
1. Impact
Solaris 10 systems may panic in the tcp_fuse_rcv_drain() TCP/IP
function when using TCP loopback connections, where both ends of the
connection are on the same system. This may allow a local unprivileged
user to cause a Denial of Service (DoS) condition on the affected
host.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 118833-23
x86 Platform
* Solaris 10 without patch 118855-19
Note: Solaris 8 and Solaris 9 are not impacted by this issue.
3. Symptoms
A system panic in tcp_fuse_rcv_drain() TCP/IP function is
representative of this issue.
4. Relief/Workaround
To work around the described issue until patches can be installed,
disable TCP Fusion by adding the following line to the "/etc/system"
file and rebooting the system:
set ip:do_tcp_fusion = 0x0
Undo the above change to the "/etc/system" file and reboot to
re-enable TCP Fusion.
Note: The workaround option above may affect performance.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 118833-23 or later
x86 Platform
* Solaris 10 with patch 118855-19 or later
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20.10.2006
Security Vulnerability in the Solaris 10 TCP Fusion Code May Lead to a System Panic, Resulting in a Denial of Service (DoS)
Solaris 10 systems may panic in the tcp_fuse_rcv_drain() TCP/IP function when using TCP loopback connections, where both ends of the connection are on the same system.
