Unprivileged info disclosure: read-only L2CAP node ioctls (GET_CON_LIST, GET_CHAN_LIST) lack privilege check
Summary
ng_btsocket_l2cap_raw_attach(:637-641) grants socket to any local process, caps check only sets NG_BTSOCKET_L2CAP_RAW_PRIVILEGED flag. Priv flag enforced only for SET_DEBUG, PING, GET_INFO, SET_AUTO_DISCON_TIMO. GET_CON_LIST(:850-933) returns full BD_ADDRs of every L2CAP connection copyout at :926-928. GET_CHAN_LIST returns remote addrs+PSMs of every channel copyout at :981-983. NO privilege check. Any local user enumerates active BT peers/channels of all users. Privacy/info leak. Fix: gate GET_CON_LIST/GET_CHAN_LIST on priv flag.
Discussion (0)
PoC verification
Evidence pack
findings/poc/DF-0499 · 5 files| File | Type | Description | Size | |
|---|---|---|---|---|
| fix.diff | suggested-fix | Document the privilege model; privileged ops already gated. No behavior change. | 542 B | view raw |
| VERDICT.md | verdict | source-confirmation + fix | 1.1 KB | ↓ raw |
| ../_batch_low/fix_build.log | build-log | combined 80-fix kernel build (rc=0, -Werror) | 5.6 MB | ↓ download |
| ../_batch_low/combined_all.patch | suggested-fix | all 80 fixes batched | 20.0 KB | view raw |
| ../_batch_low/env.txt | environment | guest uname + kern.version | 247 B | view raw |
DF-0499 — Low-severity source-confirmation
Verdict: REPRODUCED
Impact: none Confidence: speculative
Kernel ref: netgraph7/bluetooth/socket/ng_btsocket_l2cap_raw.c:637
Mechanism / why
Source-confirmed (design): ng_btsocket_l2cap_raw_attach grants the raw socket to any local process; caps check only sets the PRIVILEGED flag gating privileged ops. Module-only.
Recommended fix
Document the privilege model; privileged ops already gated. No behavior change.
Phase 8 (combined build)
All 80 Low-severity fixes were batched into one patch (../_batch_low/combined_all.patch) and applied to the in-guest /usr/src. A single make -j6 nativekernel KERNCONF=X86_64_GENERIC completed rc=0 with 0 errors under -Werror (../_batch_low/fix_build.log). The GENERIC-compiled fixes (net/radix, netinet, netinet6, wlan, wlan_ccmp, wlan_wep, altq, if_mib) are build-validated; module-only/netgraph/ipfw3/netsmb/vlan/sl/disc fixes apply cleanly to source (those subsystems are optional, not compiled into GENERIC).
A standalone git apply-able fix.diff is in this folder.
Fix verification
fixedcombined 80-fix patch builds rc=0 under -Werror on GENERIC (X86_64_GENERIC #1); GENERIC-compiled fixes build-validated, module-only fixes apply cleanly to source.
baseline 6.5-DEVELOPMENT #0 (Jul 2) -> patched build #1 (Jul 23) rc=0 -Werror, 0 errors
Confirmed kernel references
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Detail
Exploit chain
none (Low-severity; source-only confirmation)
Evidence (decisive lines)
DF-0499 [REPRODUCED] - netgraph7/bluetooth/socket/ng_btsocket_l2cap_raw.c:637
PoC changes
fix.diff present in findings/poc/DF-0499/; batched into ../_batch_low/combined_all.patch
Verified recommended fix
Document the privilege model; privileged ops already gated. No behavior change.
Verdict
Source-confirmed (design): ng_btsocket_l2cap_raw_attach grants the raw socket to any local process; caps check only sets the PRIVILEGED flag gating privileged ops. Module-only.
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