NULL pointer dereference in libreswan - CVE-2019-12312
Published: May 12, 2020
Vulnerability identifier: #VU27711
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-12312
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference issue within the send_v2N_spi_response_from_state() function in programs/pluto/ikev2_send.c. A remote attacker can cause an assertion failure by initiating an IKEv2 IKE_SA_INIT exchange, followed by a bogus INFORMATIONAL exchange instead of the expected IKE_AUTH exchange and cause the pluto IKE daemon to restart.
Affected software
libreswan
libreswan (Alpine package)
libreswan (Alpine package)
How to mitigate CVE-2019-12312
Install update from vendor's website.
libreswan - update to 3.28
libreswan (Alpine package) - update to 3.29-r0
libreswan (Alpine package) - update to 3.29-r0
External References
- http://www.iwantacve.cn/index.php/archives/218/
- https://github.com/libreswan/libreswan/compare/9b1394e...3897683
- https://github.com/libreswan/libreswan/issues/246
- https://libreswan.org/security/CVE-2019-12312/CVE-2019-12312.txt
- https://libreswan.org/security/CVE-2019-12312/libreswan-3.27-CVE-2019-12312.patch