372 lines
20 KiB
JSON
372 lines
20 KiB
JSON
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"value": "<p>Improper Handling of Exceptional Conditions vulnerability in Erlang OTP <code>erts</code> (<code>epmd</code>) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.</p>\n<p>The <code>do_accept</code> function in <code>erts/epmd/src/epmd_srv.c</code> calls <code>epmd_cleanup_exit()</code> when <code>accept(2)</code> returns <code>EMFILE</code> (per-process file descriptor limit reached) or <code>ENFILE</code> (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing <code>accept(2)</code> to return <code>EMFILE</code>, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.</p>\n<p>On Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both <code>epmd.service</code> and <code>epmd.socket</code> and requiring manual operator intervention to recover.</p>\n<p>This issue affects OTP from OTP 17.0 before OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4.</p>"
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"value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP `erts` (`epmd`) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe `do_accept` function in `erts/epmd/src/epmd_srv.c` calls `epmd_cleanup_exit()` when `accept(2)` returns `EMFILE` (per-process file descriptor limit reached) or `ENFILE` (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing `accept(2)` to return `EMFILE`, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both `epmd.service` and `epmd.socket` and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4."
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"value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit() when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4."
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 6.3,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subConfidentialityImpact": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
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"cweId": "CWE-755",
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-42792"
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}
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"source": {
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"discovery": "EXTERNAL"
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"title": "epmd permanent DoS via EMFILE on accept(2) in erts",
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"value": "<ul>\n<li>Restrict epmd to loopback only by adding a systemd socket override: set <code>ListenStream=</code> (empty, to clear), then <code>ListenStream=127.0.0.1:4369</code> and <code>ListenStream=[::1]:4369</code> in <code>/etc/systemd/system/epmd.socket.d/override.conf</code>.</li>\n<li>On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding <code>LimitNOFILE=65536</code> and <code>Restart=always</code> with a suitable <code>RestartSec</code> in <code>/etc/systemd/system/epmd.service.d/override.conf</code>.</li>\n<li>Restrict network access to TCP port 4369 via firewall rules to trusted hosts only.</li>\n</ul>"
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"value": "* Restrict epmd to loopback only by adding a systemd socket override: set `ListenStream=` (empty, to clear), then `ListenStream=127.0.0.1:4369` and `ListenStream=[::1]:4369` in `/etc/systemd/system/epmd.socket.d/override.conf`.\n* On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding `LimitNOFILE=65536` and `Restart=always` with a suitable `RestartSec` in `/etc/systemd/system/epmd.service.d/override.conf`.\n* Restrict network access to TCP port 4369 via firewall rules to trusted hosts only."
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"value": "* Restrict epmd to loopback only by adding a systemd socket override: set ListenStream= (empty, to clear), then ListenStream=127.0.0.1:4369 and ListenStream=[::1]:4369 in /etc/systemd/system/epmd.socket.d/override.conf.\n* On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding LimitNOFILE=65536 and Restart=always with a suitable RestartSec in /etc/systemd/system/epmd.service.d/override.conf.\n* Restrict network access to TCP port 4369 via firewall rules to trusted hosts only."
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"timestamp": "2026-07-27T17:25:58.879765Z",
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"id": "CVE-2026-42792",
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||
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"title": "CISA ADP Vulnrichment",
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