Upstream information
Description
c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in read_answers() when process_answer() may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed the connection immediately after a response. If there was an issue trying to put that new transaction on the wire, it would close the connection handle, but read_answers() was still expecting the connection handle to be available to possibly dequeue other responses. In theory a remote attacker might be able to trigger this by flooding the target with ICMP UNREACHABLE packets if they also control the upstream nameserver and can return a result with one of those conditions, this has been untested. Otherwise only a local attacker might be able to change system behavior to make send()/write() return a failure condition. This vulnerability is fixed in 1.34.5.SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having moderate severity.
| SUSE | |
|---|---|
| Base Score | 6.5 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | Low |
| Availability Impact | High |
| CVSSv3 Version | 3.1 |
| CNA (GitHub) | SUSE | |
|---|---|---|
| Base Score | 8.3 | 8.3 |
| Vector | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N |
| Attack Vector | Network | Network |
| Attack Complexity | High | Low |
| Attack Requirements | None | Present |
| Privileges Required | None | None |
| User Interaction | None | None |
| Vulnerable System Confidentiality Impact | Low | None |
| Vulnerable System Integrity Impact | Low | Low |
| Vulnerable System Availability Impact | High | High |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
No SUSE Security Announcements cross referenced.
List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| openSUSE Tumbleweed |
| Patchnames: openSUSE-Tumbleweed-2025-14977 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP6 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | c-ares | Not affected |
| SUSE Linux Enterprise Micro 5.1 | c-ares | Not affected |
| SUSE Linux Enterprise Micro 5.2 | c-ares | Not affected |
| SUSE Linux Enterprise Micro 5.3 | c-ares | Not affected |
| SUSE Linux Enterprise Micro 5.4 | c-ares | Not affected |
| SUSE Linux Enterprise Micro 5.5 | c-ares | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | c-ares | Not affected |
| SUSE Linux Micro 6.0 | c-ares | Not affected |
| SUSE Linux Micro 6.1 | c-ares | Not affected |
| SUSE Manager Proxy 4.3 | c-ares | Not affected |
| SUSE Manager Retail Branch Server 4.3 | c-ares | Not affected |
| SUSE Manager Server 4.3 | c-ares | Not affected |
| openSUSE Leap 15.6 | c-ares | Not affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | c-ares | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | c-ares | Not affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE CaaS Platform 4.0 | c-ares | Not affected |
| SUSE Enterprise Storage 6 | c-ares | Not affected |
| SUSE Enterprise Storage 7 | c-ares | Not affected |
| SUSE Enterprise Storage 7.1 | c-ares | Not affected |
| SUSE Linux Enterprise Desktop 15 | c-ares | Not affected |
| SUSE Linux Enterprise Desktop 15 SP1 | c-ares | Not affected |
| SUSE Linux Enterprise Desktop 15 SP2 | c-ares | Not affected |
| SUSE Linux Enterprise Desktop 15 SP4 | c-ares | Not affected |
| SUSE Linux Enterprise Desktop 15 SP5 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | c-ares | Not affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 | c-ares | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | c-ares | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | c-ares | Not affected |
| SUSE Linux Enterprise Real Time 15 SP2 | c-ares | Not affected |
| SUSE Linux Enterprise Real Time 15 SP3 | c-ares | Not affected |
| SUSE Linux Enterprise Real Time 15 SP4 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP1 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | c-ares | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Server 15-LTSS | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | c-ares | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | c-ares | Not affected |
| SUSE Manager Proxy 4.0 | c-ares | Not affected |
| SUSE Manager Proxy 4.1 | c-ares | Not affected |
| SUSE Manager Proxy 4.2 | c-ares | Not affected |
| SUSE Manager Retail Branch Server 4.0 | c-ares | Not affected |
| SUSE Manager Retail Branch Server 4.1 | c-ares | Not affected |
| SUSE Manager Retail Branch Server 4.2 | c-ares | Not affected |
| SUSE Manager Server 4.0 | c-ares | Not affected |
| SUSE Manager Server 4.1 | c-ares | Not affected |
| SUSE Manager Server 4.2 | c-ares | Not affected |
| openSUSE Leap 15.4 | c-ares | Not affected |
| openSUSE Leap 15.5 | c-ares | Not affected |
| openSUSE Leap Micro 5.2 | c-ares | Not affected |
| openSUSE Leap Micro 5.3 | c-ares | Not affected |
| openSUSE Leap Micro 5.4 | c-ares | Not affected |
| openSUSE Leap Micro 5.5 | c-ares | Not affected |
SUSE Timeline for this CVE
CVE page created: Tue Apr 8 16:00:01 2025CVE page last modified: Sat Apr 19 18:13:29 2025