L2TPD Weak Random Number Generator Seeding Vulnerability

BID:5451

Info

L2TPD Weak Random Number Generator Seeding Vulnerability

Bugtraq ID: 5451
Class: Design Error
CVE:
Remote: Yes
Local: No
Published: Aug 13 2002 12:00AM
Updated: Aug 13 2002 12:00AM
Credit: Reported by Jeff Mcadams <[email protected]>.
Vulnerable: l2tpd l2tpd 0.67
+ Debian Linux 3.0
l2tpd l2tpd 0.66
l2tpd l2tpd 0.65
l2tpd l2tpd 0.64
l2tpd l2tpd 0.63
l2tpd l2tpd 0.62
Not Vulnerable: l2tpd l2tpd 0.68

Discussion

L2TPD Weak Random Number Generator Seeding Vulnerability

l2tpd is a Layer 2 Tunneling Protocol daemon, implementing the protocol defined in RFC 2661.

Some versions of l2tpd fail to seed the random number generator before calling the function rand(). Predictable random numbers may be used for tunnel and session ids, and within the challenge / response mechanism.

A remote attacker may be able to exploit this weakness to predict the behavior of l2tpd, and possibly to attempt a man in the middle attack or to inject malicious data into a legitimate connection.

Exploit / POC

L2TPD Weak Random Number Generator Seeding Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

L2TPD Weak Random Number Generator Seeding Vulnerability

Solution:
An updated version is available:


l2tpd l2tpd 0.62

l2tpd l2tpd 0.63

l2tpd l2tpd 0.64

l2tpd l2tpd 0.65

l2tpd l2tpd 0.66

l2tpd l2tpd 0.67

References

L2TPD Weak Random Number Generator Seeding Vulnerability

References:

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