buglwIP - A Lightweight TCP/IP stack - Bugs: bug #64847, Error in sendtrap v2c


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bug #64847: Error in sendtrap v2c

Submitter:  Andrew <andi>
Submitted:  Fri 03 Nov 2023 08:11:53 AM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
lwIP version:  2.2.0

Fri 03 Nov 2023 08:11:53 AM UTC, original submission:  

There are bug in snmp_traps.c
Line 394-395

  if (trap_msg->snmp_version == SNMP_VERSION_2c) {
      struct snmp_obj_id snmp_trap_oid =  { 0 };  /* used for...
  struct snmp_obj_id snmp_trap_oid =  { 0 };  /* used for ...
  if (trap_msg->snmp_version == SNMP_VERSION_2c) {

An OID is created, a pointer is written to it in varbind[1].value.
The memory will be cleared when we leave the curly braces, and the snmp_varbind_len structure will be located in the same place. When calculating the length of varbind[1].value is corrupted.
(In         snmp_trap_varbind_sum
and snmp_asn1_enc_length_cnt)

Andrew <andi>


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