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authorBernhard Schmidt <berni@debian.org>2021-04-28 14:38:07 +0200
committerBernhard Schmidt <berni@debian.org>2021-04-28 15:12:01 +0200
commita398f557fd1320096e140f8ca297481ae75e12b3 (patch)
tree120765e28976d039124f6962e2d2e7ee554e1b3c /src/openvpn/mbuf.c
parenta8b5c8b8223889ccbb3f415ba206027a4f1b3b67 (diff)
CVE-2020-15078: Authentication bypass with deferred authentication
Overview OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass authentication and access control channel data on servers configured with deferred authentication, which can be used to potentially trigger further information leaks. Detailed description This bug allows - under very specific circumstances - to trick a server using delayed authentication (plugin or management) into returning a PUSH_REPLY before the AUTH_FAILED message, which can possibly be used to gather information about a VPN setup. In combination with "--auth-gen-token" or a user-specific token auth solution it can be possible to get access to a VPN with an otherwise-invalid account. Pre-Dependency: CVE-2020-15078-0.patch: https://github.com/OpenVPN/openvpn/commit/14511010 CVE-Fix: CVE-2020-15078-1.patch: https://github.com/OpenVPN/openvpn/commit/3aca477a CVE-2020-15078-2.patch: https://github.com/OpenVPN/openvpn/commit/3d18e308 CVE-2020-15078-3.patch: https://github.com/OpenVPN/openvpn/commit/f7b3bf06 Closes: #987380
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