Missing Authentication for Critical Function in Shadowsocks-libev - CVE-2019-5163
Published: December 4, 2019 / Updated: January 30, 2020
Vulnerability identifier: #VU23392
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2019-5163
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Shadowsocks
Affected software:
Shadowsocks-libev
Shadowsocks-libev
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists in the UDPRelay functionality when utilizing a Stream Cipher and a "local_address". A remote attacker can send a specially crafted UDP packets and cause a FATAL error code path and exit.
How to mitigate CVE-2019-5163
Install updates from vendor's website.