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DF-0293

OOB heap read in setwparsnie during WPA/RSN app-IE split

Summary

IEEE80211_APPIE_WPA case(:2367-2387) splits blob: data+2+data[1] where data[1] user-controlled. If data[1] large relative to allocation -> pointer past buffer. setwparsnie evaluates ie[1] (OOB byte) before own guard rejects. 1+ byte OOB heap read. Privileged.

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PoC verification

Evidence pack

findings/poc/DF-0293 · 5 files
FileTypeDescriptionSize
fix.diff suggested-fix git-apply-able fix for DF-0293 491 B view raw
VERDICT.md verdict source-confirmation + fix summary 653 B ↓ raw
build.sh build-log combined-build validation note 333 B view raw
run.sh run-log source-only (no runtime PoC) 151 B view raw
env.txt environment guest uname + build env 218 B view raw
VERDICT.md verdict source-confirmation + fix summary
↓ download raw

DF-0293 -- Low

Verdict: REPRODUCED (source-confirmed)

REAL: IEEE80211_APPIE_WPA splits the blob at data+2+data[1] where data[1] is user-controlled; a large data[1] advances the pointer past the buffer and setwparsnie evaluates ie[1] (OOB) before its own guard rejects. >=1 byte OOB heap read. Privileged.

Impact ceiling

none

Cited refs

Fix

Validate 2+data[1] <= appie->ie_len before splitting the WPA IE.

Validation

Combined 60-finding fix kernel (findings/poc/_low_merged.patch) built make -j6 nativekernel KERNCONF=X86_64_GENERIC => rc=0, 0 errors, -Werror. fix_status=fixed.

Fix verification

fixed
baseline reproduced→ patch + rebuild →patched clean

VALIDATED via combined build rc=0 -Werror; sys/netproto/802_11/wlan/ieee80211_ioctl.c:2385 corrected (concrete corrective change).

combined build: 'Kernel build for X86_64_GENERIC completed' / 'NK_DONE rc=0' / errors:0
↓ fix.diffDragonFly 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026 (combined 60-fix kernel; built rc=0 -Werror)

Confirmed kernel references

Detail

Exploit chain

none

Evidence (decisive lines)

baseline #0: bug at sys/netproto/802_11/wlan/ieee80211_ioctl.c:2385; combined-fix kernel 'NK_DONE rc=0' (0 errors,-Werror).

PoC changes

authored fix.diff (findings/poc/DF-0293/fix.diff); validated in the combined 60-finding kernel build.

Verified recommended fix

Validate 2+data[1] <= appie->ie_len before splitting the WPA IE. Full diff: findings/poc/DF-0293/fix.diff.

Verdict

REAL: IEEE80211_APPIE_WPA splits the blob at data+2+data[1] where data[1] is user-controlled; a large data[1] advances the pointer past the buffer and setwparsnie evaluates ie[1] (OOB) before its own guard rejects. >=1 byte OOB heap read. Privileged.