CVE-2021-26676

gdhcp in ConnMan before 1.39 could be used by network-adjacent attackers to leak sensitive stack information, allowing further exploitation of bugs in gdhcp.

gdhcp in ConnMan before 1.39 could be used by network-adjacent attackers to leak sensitive stack information, allowing further exploitation of bugs in gdhcp.

A remote information leak vulnerability and a remote buffer overflow vulnerability were discovered in ConnMan, which could result in denial of service or the execution of arbitrary code (CVE-2021-26675, CVE-2021-26676).

This update for connman fixes the following issues:

Update to 1.39 (boo#1181751):

• Fix issue with scanning state synchronization and iwd.
• Fix issue with invalid key with 4-way handshake offloading.
• Fix issue with DNS proxy length checks to prevent buffer overflow. (CVE-2021-26675)
• Fix issue with DHCP leaking stack data via uninitialized variable. (CVE-2021-26676)

Update to 1.38:

• Fix issue with online check on IP address update.
• Fix issue with OpenVPN and encrypted private keys.
• Fix issue with finishing of VPN connections.
• Add support for updated stable iwd APIs.
• Add support for WireGuard networks.

Update to 1.37:

• Fix issue with handling invalid gateway addresses.
• Fix issue with handling updates of default gateway.
• Fix issue with DHCP servers that require broadcast flag.
• Add support for option to use gateways as time servers.
• Add support for option to select default technology.
• Add support for Address Conflict Detection (ACD).
• Add support for IPv6 iptables management.

Change in 1.36:

• Fix issue with DNS short response on error handling.
• Fix issue with handling incoming DNS requests.
• Fix issue with handling empty timeserver list.
• Fix issue with incorrect DHCP byte order.
• Fix issue with AllowDomainnameUpdates handling.
• Fix issue with IPv4 link-local IP conflict error.
• Fix issue with handling WISPr over TLS connections.
• Fix issue with WiFi background scanning handling.
• Fix issue with WiFi disconnect+connect race condition.
• Fix issue with WiFi scanning and tethering operation.
• Fix issue with WiFi security change handling.
• Fix issue with missing signal for WPS changes.
• Fix issue with online check retry handling.
• Add support for systemd-resolved backend.
• Add support for mDNS configuration setup.

This update for connman fixes the following issues:

Update to 1.39 (boo#1181751):

• Fix issue with scanning state synchronization and iwd.
• Fix issue with invalid key with 4-way handshake offloading.
• Fix issue with DNS proxy length checks to prevent buffer overflow. (CVE-2021-26675)
• Fix issue with DHCP leaking stack data via uninitialized variable. (CVE-2021-26676)

Update to 1.38:

• Fix issue with online check on IP address update.
• Fix issue with OpenVPN and encrypted private keys.
• Fix issue with finishing of VPN connections.
• Add support for updated stable iwd APIs.
• Add support for WireGuard networks.

Update to 1.37:

• Fix issue with handling invalid gateway addresses.
• Fix issue with handling updates of default gateway.
• Fix issue with DHCP servers that require broadcast flag.
• Add support for option to use gateways as time servers.
• Add support for option to select default technology.
• Add support for Address Conflict Detection (ACD).
• Add support for IPv6 iptables management.

Change in 1.36:

• Fix issue with DNS short response on error handling.
• Fix issue with handling incoming DNS requests.
• Fix issue with handling empty timeserver list.
• Fix issue with incorrect DHCP byte order.
• Fix issue with AllowDomainnameUpdates handling.
• Fix issue with IPv4 link-local IP conflict error.
• Fix issue with handling WISPr over TLS connections.
• Fix issue with WiFi background scanning handling.
• Fix issue with WiFi disconnect+connect race condition.
• Fix issue with WiFi scanning and tethering operation.
• Fix issue with WiFi security change handling.
• Fix issue with missing signal for WPS changes.
• Fix issue with online check retry handling.
• Add support for systemd-resolved backend.
• Add support for mDNS configuration setup.

This update was imported from the openSUSE:Leap:15.2:Update update project.

These are all security issues fixed in the connman-1.40-2.2 package on the GA media of openSUSE Tumbleweed.

It was discovered that ConnMan could be made to write out of bounds. A remote attacker could possibly use this issue to cause ConnMan to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-26675, CVE-2021-33833)

It was discovered that ConnMan could be made to leak sensitive information via the gdhcp component. A remote attacker could possibly use this issue to obtain information for further exploitation. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-26676)

It was discovered that ConnMan could be made to read out of bounds. A remote attacker could possibly use this issue to case ConnMan to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. (CVE-2022-23096, CVE-2022-23097)

It was discovered that ConnMan could be made to run into an infinite loop. A remote attacker could possibly use this issue to cause ConnMan to consume resources and to stop operating, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. (CVE-2022-23098)

It was discovered that ConnMan could be made to write out of bounds via the gweb component. A remote attacker could possibly use this issue to cause ConnMan to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. (CVE-2022-32292)

It was discovered that ConnMan did not properly manage memory under certain circumstances. A remote attacker could possibly use this issue to cause ConnMan to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. (CVE-2022-32293)

It was discovered that ConnMan could be made to write out of bounds via the gdhcp component. A remote attacker could possibly use this issue to cause ConnMan to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-28488)