An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent downstream RSVP neighbor to cause kernel memory exhaustion, leading to a kernel crash, resulting in a Denial of Service (DoS).

The kernel memory leak and eventual crash will be seen when the downstream RSVP neighbor has a persistent error which will not be corrected.

System kernel memory can be monitored through the use of the 'show system statistics kernel memory' command as shown below:

user@router> show system statistics kernel memory
Memory                 Size (kB)  Percentage  When
  Active                  753092       18.4%  Now
  Inactive                574300       14.0%  Now
  Wired                  443236       10.8%  Now
  Cached                1911204       46.6%  Now
  Buf                      32768      0.8%  Now
  Free                    385072      9.4%  Now
Kernel Memory                             Now
  Data                    312908      7.6%  Now
  Text                      2560      0.1%  Now
...

This issue affects:
Junos OS:


  *  All versions before 20.4R3-S9,
  *  from 21.4 before 21.4R3-S5,
  *  from 22.1 before 22.1R3-S5,
  *  from 22.2 before 22.2R3-S3,
  *  from 22.3 before 22.3R3-S2,
  *  from 22.4 before 22.4R3,
  *  from 23.2 before 23.2R2;


Junos OS Evolved:


  *  All versions before 21.4R3-S5-EVO,
  *  from 22.1-EVO before 22.1R3-S5-EVO, 
  *  from 22.2-EVO before 22.2R3-S3-EVO, 
  *  from 22.3-EVO before 22.3R3-S2-EVO, 
  *  from 22.4-EVO before 22.4R3-EVO, 
  *  from 23.2-EVO before 23.2R2-EVO.

An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent downstream RSVP neighbor to cause kernel memory exhaustion, leading to a kernel crash, resulting in a Denial of Service (DoS).

The kernel memory leak and eventual crash will be seen when the downstream RSVP neighbor has a persistent error which will not be corrected.

System kernel memory can be monitored through the use of the 'show system statistics kernel memory' command as shown below:

user@router> show system statistics kernel memory
Memory                 Size (kB)  Percentage  When
  Active                  753092       18.4%  Now
  Inactive                574300       14.0%  Now
  Wired                  443236       10.8%  Now
  Cached                1911204       46.6%  Now
  Buf                      32768      0.8%  Now
  Free                    385072      9.4%  Now
Kernel Memory                             Now
  Data                    312908      7.6%  Now
  Text                      2560      0.1%  Now
...

This issue affects:
Junos OS:


  *  All versions before 20.4R3-S9,
  *  All versions of 21.2,
  *  from 21.4 before 21.4R3-S5,
  *  from 22.1 before 22.1R3-S5,
  *  from 22.2 before 22.2R3-S3,
  *  from 22.3 before 22.3R3-S2,
  *  from 22.4 before 22.4R3,
  *  from 23.2 before 23.2R2;


Junos OS Evolved:


  *  All versions before 21.4R3-S5-EVO,
  *  from 22.1-EVO before 22.1R3-S5-EVO, 
  *  from 22.2-EVO before 22.2R3-S3-EVO, 
  *  from 22.3-EVO before 22.3R3-S2-EVO, 
  *  from 22.4-EVO before 22.4R3-EVO, 
  *  from 23.2-EVO before 23.2R2-EVO.