CVE-2015-3294

The tcp_request function in Dnsmasq before 2.73rc4 does not properly handle the return value of the setup_reply function, which allows remote attackers to read process memory and cause a denial of service (out-of-bounds read and crash) via a malformed DNS request.

Updated dnsmasq packages fix security vulnerability:

Dnsmasq could be made to crash or expose sensitive information if it received specially crafted network traffic (CVE-2015-3294).

These are all security issues fixed in the dnsmasq-2.76-1.3 package on the GA media of openSUSE Tumbleweed.

The DNS server dnsmasq was updated to fix one security issue and one non-security bug.

The following vulnerability was fixed:

• CVE-2015-3294: A remote unauthenticated attacker could have caused a denial of service (DoS) or read heap memory, potentially disclosing information such as performed DNS queries or encryption keys. (bsc#928867)

The following bug was fixed:

• bsc#923144: When answer to an upstream query is a CNAME pointing to an A/AAAA record which is present locally (/etc/hosts), allow caching when the upstream and local A/AAAA records have the same value.

The DNS server dnsmasq was updated to fix one security issue and one non-security bug.

The following vulnerability was fixed:

• CVE-2015-3294: A remote unauthenticated attacker could have caused a denial of service (DoS) or read heap memory, potentially disclosing information such as performed DNS queries or encryption keys. (bsc#928867)

The following bug was fixed:

• bsc#923144: When answer to an upstream query is a CNAME pointing to an A/AAAA record which is present locally (/etc/hosts), allow caching when the upstream and local A/AAAA records have the same value.

This update provides dnsmasq version 2.71, which brings several fixes and enhancements. For a comprehensive list of changes, please refer to the package change log. (FATE#317370)

This update for dnsmasq fixes the following issues.

Remedy the following security issues:

• CVE-2017-14491: 2 byte heap based overflow. [bsc#1060354]
• CVE-2017-14492: heap based overflow. [bsc#1060355]
• CVE-2017-14493: stack based overflow. [bsc#1060360]
• CVE-2017-14494: DHCP - info leak. [bsc#1060361]
• CVE-2017-14495: DNS - OOM DoS. [bsc#1060362]
• CVE-2017-14496: DNS - DoS Integer underflow. [bsc#1060364]
• Prevent a man-in-the-middle attack (bsc#972164, fate#321175).

Furthermore, the following issues have been fixed:

• Fix DHCP relaying, broken in 2.76 and 2.77.
• Update to version 2.78 (fate#321175, fate#322030, bsc#1035227).
• Fix PXE booting for UEFI architectures (fate#322030).
• Drop PrivateDevices=yes which breaks logging (bsc#902511, bsc#904537)
• Build with support for DNSSEC (fate#318323, bsc#908137).

Please note that this update brings a (small) potential incompatibility in the handling of 'basename' in --pxe-service. Please read the CHANGELOG and the documentation if you are using this option.

This update for dnsmasq fixes the following security issues:

• CVE-2017-14491: 2 byte heap based overflow. [bsc#1060354]
• CVE-2017-14492: heap based overflow. [bsc#1060355]
• CVE-2017-14493: stack based overflow. [bsc#1060360]
• CVE-2017-14494: DHCP - info leak. [bsc#1060361]
• CVE-2017-14495: DNS - OOM DoS. [bsc#1060362]
• CVE-2017-14496: DNS - DoS Integer underflow. [bsc#1060364]

This update brings a (small) potential incompatibility in the handling of 'basename' in --pxe-service. Please read the CHANGELOG and the documentation if you are using this option.

This update for dnsmasq fixes the following security issues:

• CVE-2017-14491: 2 byte heap based overflow. [bsc#1060354]
• CVE-2017-14492: heap based overflow. [bsc#1060355]
• CVE-2017-14493: stack based overflow. [bsc#1060360]
• CVE-2017-14494: DHCP - info leak. [bsc#1060361]
• CVE-2017-14495: DNS - OOM DoS. [bsc#1060362]
• CVE-2017-14496: DNS - DoS Integer underflow. [bsc#1060364]

This update brings a (small) potential incompatibility in the handling of 'basename' in --pxe-service. Please read the CHANGELOG and the documentation if you are using this option.

The tcp_request function in Dnsmasq before 2.73rc4 does not properly handle the return value of the setup_reply function, which allows remote attackers to read process memory and cause a denial of service (out-of-bounds read and crash) via a malformed DNS request.

Nick Sampanis discovered that Dnsmasq incorrectly handled certain malformed DNS requests. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service, or possibly obtain sensitive information.