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Advisories

BlueALSA bluealsad LC3plus Decoder Division-by-Zero DoS

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severity
low
date
Affecting

  • bluez-alsa < 1a84465dd860d1be9dcf62339c6273e9e0632dd2

CWE
  • CWE-369 Divide By Zero
CVSS
2.1
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References
Credit
Harsh Raj Singhania
Description
BlueALSA (bluez-alsa/bluealsad) contains a division-by-zero vulnerability in the LC3plus sink decoder (a2dp-lc3plus.c, a2dp_lc3plus_dec_thread) that allows a Bluetooth-adjacent attacker to crash the daemon by sending a crafted RTP media header with an attacker-controlled frame count field set to zero. Attackers can establish an A2DP source connection with an LC3plus session negotiated against a victim running bluealsad as an A2DP sink and transmit a non-fragmented LC3plus media header with a zero frame count to trigger a SIGFPE in the decoding thread, causing a denial of service on builds compiled with LC3plus support enabled.

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