Chad Loder has discovered vulnerabilities in tcpdump's ISAKMP protocol handler. During an audit to repair these issues, Bill Fenner discovered some related problems.

These vulnerabilities may be used by an attacker to crash a running `tcpdump' process. They can only be triggered if the `-v' command line option is being used.

NOTE: the racoon ISAKMP/IKE daemon incorporates the ISAKMP protocol handler from tcpdump, and so is also affected by this issue.

lt 3.8.3

lt 20040408a

Problem Description:

An un-checked return value in the BGP dissector code can result in an integer overflow. This value is used in subsequent buffer management operations, resulting in a stack based buffer overflow under certain circumstances.

Impact:

By crafting malicious BGP packets, an attacker could exploit this vulnerability to execute code or crash the tcpdump process on the target system. This code would be executed in the context of the user running tcpdump(1). It should be noted that tcpdump(1) requires privileges in order to open live network interfaces.

Workaround:

No workaround is available.

lt 3.9.6

Problem Description

Several tcpdump protocol decoders contain programming errors which can cause them to go into infinite loops.

Impact

An attacker can inject specially crafted packets into the network which, when processed by tcpdump, could lead to a denial-of-service. After the attack, tcpdump would no longer capture traffic, and would potentially use all available processor time.

lt 3.8.3_2

Problem Description

Several tcpdump protocol decoders contain programming errors which can cause them to go into infinite loops.

Impact

An attacker can inject specially crafted packets into the network which, when processed by tcpdump, could lead to a denial-of-service. After the attack, tcpdump would no longer capture traffic, and would potentially use all available processor time.

lt 3.8.3_2

Problem Description:

An un-checked return value in the BGP dissector code can result in an integer overflow. This value is used in subsequent buffer management operations, resulting in a stack based buffer overflow under certain circumstances.

Impact:

By crafting malicious BGP packets, an attacker could exploit this vulnerability to execute code or crash the tcpdump process on the target system. This code would be executed in the context of the user running tcpdump(1). It should be noted that tcpdump(1) requires privileges in order to open live network interfaces.

Workaround:

No workaround is available.

lt 3.9.6

Chad Loder has discovered vulnerabilities in tcpdump's ISAKMP protocol handler. During an audit to repair these issues, Bill Fenner discovered some related problems.

These vulnerabilities may be used by an attacker to crash a running `tcpdump' process. They can only be triggered if the `-v' command line option is being used.

NOTE: the racoon ISAKMP/IKE daemon incorporates the ISAKMP protocol handler from tcpdump, and so is also affected by this issue.

lt 3.8.3

lt 20040408a