Daniel Stirnimann

**Name of the Vulnerable Software and Affected Versions** PowerDNS DNSdist versions 1.9.0 through 1.9.3 **Description** When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default. **Recommendations** For PowerDNS DNSdist versions 1.9.0 through 1.9.3, update to a version that includes the fix for this issue to prevent Denial of Service attacks. As a temporary workaround, consider disabling the DNS over HTTPS support using the nghttp2 provider until a patch is available. Restrict access to the DNSdist service to minimize the risk of exploitation.

**Name of the Vulnerable Software and Affected Versions** Nortel UNIStim IP Softphone 2050 (affected versions not specified) Nortel IP Phone 1140E (affected versions not specified) Other Nortel products from the IP Phone, Business Communications Manager (BCM), and other product lines (affected versions not specified) **Description** The issue allows remote attackers to eavesdrop on the physical environment via an Open Audio Stream message that enables "surveillance mode." This can be made easier by leveraging issues related to a small ID number space. **Recommendations** For Nortel UNIStim IP Softphone 2050, consider disabling the Open Audio Stream message functionality until a fix is available. For Nortel IP Phone 1140E, restrict access to the device to minimize the risk of exploitation. For other affected Nortel products, avoid using features that may enable "surveillance mode" until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** Nortel UNIStim IP Softphone 2050 (affected versions not specified) Nortel IP Phone 1140E (affected versions not specified) Other Nortel products from the IP Phone, Business Communications Manager (BCM), and other product lines (affected versions not specified) **Description** The issue allows remote attackers to guess the RUDP ID and spoof messages due to the limited number of different values used in the 32-bit ID number field of an RUDP datagram. This can be leveraged for an eavesdropping attack by sending many Open Audio Stream messages. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.