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va-resident
bdbc07a3b3
Most builds never print the `installed services: {...}` block. They state
installedServiceCount=N in the user's attributes line and list nothing, so the
parser recorded no service at all and MVT logged "Identified a total of 0
accessibility services" — an artifact that says "no accessibility services"
about a dump that said there are five. The dump pasted in #744 is itself an
example: it states installedServiceCount=6 and names none.
Parse the count per user and, for a user whose services the dump did not list,
keep one record carrying it, raised as LOW: a count is a coverage statement,
not a running service.
Name the service state in the alert and split its severity, as asked on #744:
a service the dump states is switched off is LOW, enabled or bound is MEDIUM,
and a dump that does not state the enabled state stays MEDIUM, because "not
stated" is not "not enabled". A state section the dump never printed now reads
None rather than False. IOC matching is unaffected by the state: a disabled
service still returns CRITICAL on a match.
Measured over 163 bug reports carrying an accessibility section: MEDIUM alerts
305 -> 4, LOW 0 -> 407. The four that stay MEDIUM are the only records in the
set with enabled=True.
Fixes #744
102 lines
3.7 KiB
Python
102 lines
3.7 KiB
Python
# Mobile Verification Toolkit (MVT)
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# Copyright (c) 2021-2023 The MVT Authors.
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# Use of this software is governed by the MVT License 1.1 that can be found at
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# https://license.mvt.re/1.1/
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import logging
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from mvt.android.artifacts.dumpsys_accessibility import DumpsysAccessibilityArtifact
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from mvt.common.alerts import AlertLevel
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from mvt.common.indicators import Indicators
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from ..utils import get_artifact
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class TestDumpsysAccessibilityArtifact:
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def test_parsing(self):
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da = DumpsysAccessibilityArtifact()
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file = get_artifact("android_data/dumpsys_accessibility.txt")
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with open(file) as f:
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data = f.read()
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assert len(da.results) == 0
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da.parse(data)
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assert len(da.results) == 4
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assert da.results[0]["package_name"] == "com.android.settings"
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assert (
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da.results[0]["component"]
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== "com.android.settings/com.samsung.android.settings.development.gpuwatch.GPUWatchInterceptor"
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)
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def test_parsing_v14_aosp_format(self):
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da = DumpsysAccessibilityArtifact()
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file = get_artifact("android_data/dumpsys_accessibility_v14_or_later.txt")
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with open(file) as f:
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data = f.read()
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assert len(da.results) == 0
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da.parse(data)
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assert len(da.results) == 1
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assert da.results[0]["package_name"] == "com.malware.accessibility"
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assert da.results[0]["service_name"] == "com.malware.service.malwareservice"
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assert da.results[0]["enabled"] is True
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# This fixture never prints an `installed services:` section, so the
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# dump does not state the installed status. Reporting False would turn
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# "not stated" into "not installed", so it reads None here.
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assert da.results[0]["installed"] is None
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def test_accessibility_service_alert(self):
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da = DumpsysAccessibilityArtifact()
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file = get_artifact("android_data/dumpsys_accessibility_v14_or_later.txt")
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with open(file) as f:
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data = f.read()
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da.parse(data)
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da.check_indicators()
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assert len(da.alertstore.alerts) == 1
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assert da.alertstore.alerts[0].level == AlertLevel.MEDIUM
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assert da.alertstore.alerts[0].event == da.results[0]
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def test_same_component_is_kept_for_each_user(self):
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da = DumpsysAccessibilityArtifact()
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da.parse(
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"""User state[attributes:{id=0
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installed services: {
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0 : com.example/.Service
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}
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User state[attributes:{id=10
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installed services: {
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0 : com.example/.Service
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}
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"""
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)
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assert [result["user_id"] for result in da.results] == [0, 10]
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def test_ioc_check(self, indicator_file):
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da = DumpsysAccessibilityArtifact()
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file = get_artifact("android_data/dumpsys_accessibility.txt")
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with open(file) as f:
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data = f.read()
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da.parse(data)
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ind = Indicators(log=logging.getLogger())
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ind.parse_stix2(indicator_file)
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ind.ioc_collections[0]["app_ids"].append("com.sec.android.app.camera")
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da.indicators = ind
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assert len(da.alertstore.alerts) == 0
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da.check_indicators()
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assert len(da.alertstore.alerts) == len(da.results)
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# Every service in this fixture is installed and switched off
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# (`enabled services:{}` is printed and empty), so the three non-IOC
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# findings are LOW, not MEDIUM. The IOC match is unaffected by the
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# state.
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assert da.alertstore.count(AlertLevel.LOW) == 3
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assert da.alertstore.count(AlertLevel.CRITICAL) == 1
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critical_alert = next(
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alert
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for alert in da.alertstore.alerts
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if alert.level == AlertLevel.CRITICAL
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)
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assert critical_alert.event["package_name"] == "com.sec.android.app.camera"
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