Date: Tue, 17 May 2016 20:40:37 +0200 From: Cedric Buissart <cbuissar@...hat.com> To: oss-security@...ts.openwall.com Subject: RHSA-2016:1086 libndp: denial of service due to insufficient validation of source of NDP messages Dear all, An improper input validation check, and improper origin check flaw during the reception of NDP message was discovered in libndp. An attacker in a non local network could use this flaw to advertise a node as a router, and cause a denial of service attack, or act as a man in the middle. The patches enforce that hop limit must be 255, to ensure that the NDP message has not been routed. Patches can be found upsteam: - libndp: validate the IPv6 hop limit https://github.com/jpirko/libndp/commit/a4892df306e0532487f1634ba6d4c6d4bb381c7f - libndb: reject redirect and router advertisements from non-link-local https://github.com/jpirko/libndp/commit/2af9a55b38b55abbf05fd116ec097d4029115839 https://people.freedesktop.org/~lkundrak/.libndp/ Known affected packages : NetworkManager >= 1.0 Thanks to Julien Bernard (Viagénie) for discovering the issue Kind regards, -- Cedric Buissart Purkynova 99 Brno 612 45
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