A Security Vulnerability in the Handling of Self Encapsulated IP Packets may Lead to a Denial of Service (DOS) Condition.

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A Security Vulnerability in the Handling of Self Encapsulated IP Packets (see details below)

1. Impact

A Security vulnerability in Solaris, related to the handling of self encapsulated IP packets,  may allow a remote privileged user to panic the system. The ability to panic the system is a type of Denial of Service (DoS).

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 8 without patch 116965-32
  
• Solaris 9 without patch 114344-34
  
• Solaris 10 without patch 127111-11

x86 Platform

• Solaris 8 without patch 116966-31
  
• Solaris 9 without patch 119435-22
  
• Solaris 10 without patch 127112-11

3. Symptoms

If the described issue occurs, the system will panic with a stack trace similar to the following:

    ip:ip_rput_local_options+0x2cc(, 0x600107fca40, 0x6000ccbcab8,
    0x6002b4acde8)
    ip:ip_options_cksum+0x8c(0x6000bcac7f8, 0x600107fca40, 0x6000ccbcab8,
    0x6002b4acde8)
    ip:ip_proto_input+0x8c(0x6000bcac7f8, 0x6000b0caa00, 0x6000ccbcab8,
    0x6002b4acde8, 0x600042009a8)
    ip:ip_proto_input+0xa34(, 0x6000b0caa00, 0x6000ccbcaa4, 0x6002b4acde8,
    0x600042009a8)
    ip:ip_fanout_proto_again+0x3ec(, 0x600042009a8, 0x600042009a8,
    0x6002b4acde8)
    ip:ip_proto_input+0xbf0(, 0x600107fca40, 0x6000ccbca94, 0x6002b4acde8,
    0x600042009a8)
    ip:ip_input+0x868(0x600042009a8, 0x600093b2040, 0x600107fca40, , ,
    0xffffffff)
    dls:soft_ring_drain+0x7c(0x60012a17d80, 0xffffffffffffffff, , , , 0x0)
    dls:soft_ring_worker+0x64(0x60012a17d80, 0x0)
    unix:thread_start+0x4()

4. Workaround

To work around the described issue, firewalls may be used to block self encapsulated IP packets.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 8 with patch 116965-32 or later
  
• Solaris 9 with patch 114344-34 or later
  
• Solaris 10 with patch 127111-11 or later

x86 Platform

• Solaris 8 with patch 116966-31 or later
  
• Solaris 9 with patch 119435-22 or later
  
• Solaris 10 with patch 127112-11 or later
  

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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