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Cisco Bug: CSCun09973 - ASR1K FP crash due to invalid L2TP UDP-Length value

Last Modified

Apr 29, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(4)S 15.3(3)S 15.4(1)S 15.4(2)S

Description (partial)

Symptom:
A vulnerability in the Layer 2 Tunneling Protocol (L2TP) module of Cisco IOS XE on Cisco ASR 1000 Series Routers could allow an authenticated, 
remote attacker to cause a reload of the processing ESP card.

The vulnerability occurs during the processing of a malformed L2TP packet. An attacker could exploit this vulnerability by sending malformed L2TP 
packets over an established L2TP session. An exploit could allow the attacker to cause a reload of the affected ESP card.

Conditions:
Device configured with ''no vpdn ip udp ignore checksum''
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Bug Details Include

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  • Status
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