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Advisories

Amlogic DroidLogic SubTitleService Infinite Loop via get_vob_spu()

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Severity
medium
Date
Affecting

  • A95X <= NEXBOX-A95X-AP6330

  • Amlogic Android SDK <= unspecified

CWE
  • CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
Matteo Strada (mstreet)
Description
The VobSub subtitle decoder libsub_vob (part of the Amlogic DroidLogic SubTitleService), as shipped on Nexbox A95X (Amlogic S905X) TV boxes contains an infinite loop vulnerability in get_vob_spu() that allows unauthenticated network attackers or local users loading malicious files to trigger an unreachable loop exit condition via mismatched length fields. Attackers can send crafted AMLU data blocks over the unauthenticated tcp/10100 listener or via a malicious VobSub (.sub) file to cause the subtitle decode thread to spin at 100% CPU indefinitely, resulting in denial of service.

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