#VU97983 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in DrayTek Corp. products - CVE-2024-41594
Vulnerability identifier: #VU97983
Vulnerability risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-338
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Vigor 1000B
Hardware solutions /
Routers for home users
Vigor 2962
Hardware solutions /
Routers for home users
Vigor 3910
Hardware solutions /
Routers for home users
Vigor 3912
Hardware solutions /
Routers for home users
Vigor 165
Hardware solutions /
Routers for home users
Vigor 166
Hardware solutions /
Routers for home users
Vigor 2135
Hardware solutions /
Routers for home users
Vigor 2763
Hardware solutions /
Routers for home users
Vigor 2765
Hardware solutions /
Routers for home users
Vigor 2766
Hardware solutions /
Routers for home users
Vigor 2865
Hardware solutions /
Routers for home users
Vigor 2866
Hardware solutions /
Routers for home users
Vigor 2915
Hardware solutions /
Routers for home users
Vigor 2620
Hardware solutions /
Routers for home users
Vigor LTE200
Hardware solutions /
Routers for home users
Vigor 2133
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2762
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2860
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2925
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2862
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2926
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2952
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 3220
Hardware solutions /
Routers & switches, VoIP, GSM, etc
Vigor 2832
Hardware solutions /
Security hardware applicances
Vendor: DrayTek Corp.
Description
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to software uses a static string to seed the PRNG in OpenSSL for TLS. A remote attacker can perform MitM attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Vigor 1000B: before 4.3.2.8
Vigor 2962: before 4.3.2.8
Vigor 3910: before 4.3.2.8
Vigor 3912: before 4.3.6.1
Vigor 165: before 4.2.7
Vigor 166: before 4.2.7
Vigor 2135: before 4.4.5.1
Vigor 2763: before 4.4.5.1
Vigor 2765: before 4.4.5.1
Vigor 2766: before 4.4.5.1
Vigor 2865: before 4.4.5.3
Vigor 2866: before 4.4.5.3
Vigor 2915: before 4.4.5.3
Vigor 2620: before 3.9.8.9
Vigor LTE200: before 3.9.8.9
Vigor 2133: before 3.9.9
Vigor 2762: before 3.9.9
Vigor 2832: before 3.9.9
Vigor 2860: before 3.9.8
Vigor 2925: before 3.9.8
Vigor 2862: before 3.9.9.5
Vigor 2926: before 3.9.9.5
Vigor 2952: before 3.9.8.2
Vigor 3220: before 3.9.8.2
External links
https://www.forescout.com/resources/draybreak-draytek-research/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
