XAPI open file limit DoS It is possible for an unauthenticated client on the network to cause XAPI to hit its file-descriptor limit. This causes XAPI to be unable to accept new requests for other (trusted) clients, and blocks XAPI from carrying out any tasks that require the opening of file descriptors.

An issue was discovered in Xen XAPI before 2020-12-15. Certain xenstore keys provide feedback from the guest, and are therefore watched by toolstack. Specifically, keys are watched by xenopsd, and data are forwarded via RPC through message-switch to xapi. The watching logic in xenopsd sends one RPC update containing all data, any time any single xenstore key is updated, and therefore has O(N^2) time complexity. Furthermore, message-switch retains recent (currently 128) RPC messages for diagnostic purposes, yielding O(M*N) space complexity. The quantity of memory a single guest can monopolise is bounded by xenstored quota, but the quota is fairly large. It is believed to be in excess of 1G per malicious guest. In practice, this manifests as a host denial of service, either through message-switch thrashing against swap, or OOMing entirely, depending on dom0's configuration. (There are no quotas in xenopsd to limit the quantity of keys that result in RPC traffic.) A buggy or malicious gu…

Stack-based buffer overflow in Yokogawa CENTUM CS 1000 R3.08.70 and earlier, CENTUM CS 3000 R3.09.50 and earlier, CENTUM CS 3000 Entry R3.09.50 and earlier, CENTUM VP R5.04.20 and earlier, CENTUM VP Entry R5.04.20 and earlier, ProSafe-RS R3.02.10 and earlier, Exaopc R3.72.00 and earlier, Exaquantum R2.85.00 and earlier, Exaquantum/Batch R2.50.30 and earlier, Exapilot R3.96.10 and earlier, Exaplog R3.40.00 and earlier, Exasmoc R4.03.20 and earlier, Exarqe R4.03.20 and earlier, Field Wireless Device OPC Server R2.01.02 and earlier, PRM R3.12.00 and earlier, STARDOM VDS R7.30.01 and earlier, STARDOM OPC Server for Windows R3.40 and earlier, FAST/TOOLS R10.01 and earlier, B/M9000CS R5.05.01 and earlier, B/M9000 VP R7.03.04 and earlier, and FieldMate R1.01 or R1.02 allows remote attackers to execute arbitrary code via a crafted packet.

Stack-based buffer overflow in Yokogawa CENTUM CS 1000 R3.08.70 and earlier, CENTUM CS 3000 R3.09.50 and earlier, CENTUM CS 3000 Entry R3.09.50 and earlier, CENTUM VP R5.04.20 and earlier, CENTUM VP Entry R5.04.20 and earlier, ProSafe-RS R3.02.10 and earlier, Exaopc R3.72.00 and earlier, Exaquantum R2.85.00 and earlier, Exaquantum/Batch R2.50.30 and earlier, Exapilot R3.96.10 and earlier, Exaplog R3.40.00 and earlier, Exasmoc R4.03.20 and earlier, Exarqe R4.03.20 and earlier, Field Wireless Device OPC Server R2.01.02 and earlier, PRM R3.12.00 and earlier, STARDOM VDS R7.30.01 and earlier, STARDOM OPC Server for Windows R3.40 and earlier, FAST/TOOLS R10.01 and earlier, B/M9000CS R5.05.01 and earlier, B/M9000 VP R7.03.04 and earlier, and FieldMate R1.01 or R1.02 allows remote attackers to cause a denial of service (network-communications outage) via a crafted packet.

Stack-based buffer overflow in Yokogawa CENTUM CS 1000 R3.08.70 and earlier, CENTUM CS 3000 R3.09.50 and earlier, CENTUM CS 3000 Entry R3.09.50 and earlier, CENTUM VP R5.04.20 and earlier, CENTUM VP Entry R5.04.20 and earlier, ProSafe-RS R3.02.10 and earlier, Exaopc R3.72.00 and earlier, Exaquantum R2.85.00 and earlier, Exaquantum/Batch R2.50.30 and earlier, Exapilot R3.96.10 and earlier, Exaplog R3.40.00 and earlier, Exasmoc R4.03.20 and earlier, Exarqe R4.03.20 and earlier, Field Wireless Device OPC Server R2.01.02 and earlier, PRM R3.12.00 and earlier, STARDOM VDS R7.30.01 and earlier, STARDOM OPC Server for Windows R3.40 and earlier, FAST/TOOLS R10.01 and earlier, B/M9000CS R5.05.01 and earlier, B/M9000 VP R7.03.04 and earlier, and FieldMate R1.01 or R1.02 allows remote attackers to cause a denial of service (process outage) via a crafted packet.

A cross-site scripting vulnerability in queryparser/termgenerator_internal.cc in Xapian xapian-core before 1.4.6 exists due to incomplete HTML escaping by Xapian::MSet::snippet().

apt-xapian-index before 0.45ubuntu2.1, 0.44ubuntu7.1, and 0.44ubuntu5.1 does not properly use D-Bus for communication with a polkit authority, which allows local users to bypass intended access restrictions by leveraging a PolkitUnixProcess PolkitSubject race condition via a (1) setuid process or (2) pkexec process, a related issue to CVE-2013-4288.