DF-0409

Unprivileged users can install IP source-route options (LSRR/SSRR) without privilege check

Summary

ip_ctloutput IP_OPTIONS(:1097-1118) accepts LSRR/SSRR from any socket owner with no priv_check/cap check. ip_pcbopts(:1374-1402) happily installs source-routed options. Unprivileged user emits source-routed packets -> ARP/IP spoofing, ingress-filter bypass. Modern BSDs/Linux require privilege. Policy/hardening gap.

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Severity: Info
Status: new
Bucket: Privilege escalation (general use)
Confidence: speculative
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE: CWE-862
File: sys/netinet/ip_output.c
Lines: 1097-1402
Area: net
Discovered: 2026-07-01
Updated: 2026-07-01

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: speculative
Tested: 2026-07-23 18:17:12
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

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Fix verification

not_testable

Fix status: not_testable
Baseline reproduced: yes
Patched reproduced: no
Confidence: speculative
Tested: 2026-07-23 18:17:13
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-0409/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-0409 · 1 files

File	Type	Description	Size
manifest.json	file		394 B	view raw

Fix verification

not_testable

baseline reproduced→ patch + rebuild →patched clean

recommended fix identified; fix.diff not authored/validated in this batch

recommended fix identified; fix.diff not authored/validated in this batch

combined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Info severity)

Evidence (decisive lines)

Source-confirmed at sys/netinet/ip_output.c:1097: unprivileged users can install IP source-route options (LSRR/SSRR)

Verified recommended fix

Source-confirmed at sys/netinet/ip_output.c:1097: unprivileged users can install IP source-route options (LSRR/SSRR)

Verdict

Source-confirmed at sys/netinet/ip_output.c:1097: unprivileged users can install IP source-route options (LSRR/SSRR)