The "pingsender" executable used by the Firefox Health Report dynamically loads a system copy of libcurl, which an attacker could replace. This allows for privilege escalation as the replaced libcurl code will run with Firefox's privileges. Note: This attack requires an attacker have local system access and only affects OS X and Linux. Windows systems are not affected. This vulnerability affects Firefox < 57.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 57.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2017-24 advisory.

  - Mozilla developers and community members Boris Zbarsky, Carsten Book, Christian Holler, Byron Campen, Jan     de Mooij, Jason Kratzer, Jesse Schwartzentruber, Marcia Knous, Randell Jesup, Tyson Smith, and Ting-Yu     Chou reported memory safety bugs present in Firefox 56. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort that some of these could be exploited to run arbitrary     code. (CVE-2017-7827)

  - A use-after-free vulnerability can occur when flushing and resizing layout because the     <code>PressShell</code> object has been freed while still in use. This results in a potentially     exploitable crash during these operations. (CVE-2017-7828)

  - The Resource Timing API incorrectly revealed navigations in cross-origin iframes. This is a same-origin     policy violation and could allow for data theft of URLs loaded by users. (CVE-2017-7830)

  - A vulnerability where the security wrapper does not deny access to some exposed properties using the     deprecated <code>exposedProps</code> mechanism on proxy objects. These properties should be explicitly     unavailable to proxy objects. (CVE-2017-7831)

  - The combined, single character, version of the letter 'i' with any of the potential accents in unicode,     such as acute or grave, can be spoofed in the addressbar by the dotless version of 'i' followed by the     same accent as a second character with most font sets. This allows for domain spoofing attacks because     these combined domain names do not display as punycode. (CVE-2017-7832)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Versions of Mozilla Firefox earlier than 57 are unpatched for the following vulnerabilities :

 - A race condition exists in 'dom/media/systemservices/MediaParent.cpp' that is triggered when getting deviceId keys. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in 'js/src/proxy/DeadObjectProxy.cpp' that is triggered when handling object proxies. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - An unspecified flaw exists in 'xpcom/threads/SystemGroup.cpp' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - An overflow condition exists in the 'nr_transport_addr_fmt_ifname_addr_string()' function in 'media/mtransport/third_party/nICEr/src/net/transport_addr.c' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to cause a stack-based buffer overflow and potentially execute arbitrary code.
 - A flaw exists in the 'nsNodeUtils::CloneAndAdopt()' function in 'dom/base/nsNodeUtils.cpp' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'GPUProcessHost::OnChannelClosed()' function in 'gfx/ipc/GPUProcessHost.cpp' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - An unspecified flaw exists in 'gfx/layers/AtomicRefCountedWithFinalize.h' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'NewReactionRecord()' function in 'js/src/builtin/Promise.cpp' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'VerifyCMSDetachedSignatureIncludingCertificate()' function in 'security/manager/ssl/nsDataSignatureVerifier.cpp' that is triggered when handling PKCS#7 signedData content. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'ContainerLayerComposite::mPrepared()' function in 'gfx/layers/composite/ContainerLayerComposite.cpp' that is triggered when handling layers. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'MArgumentsLength::computeRange()' function in 'js/src/jit/RangeAnalysis.cpp' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A use-after-free error exists in 'widget/windows/AudioSession.cpp' that is triggered when handling AudioSession objects. This may allow a context-dependent attacker to dereference already freed memory and potentially execute arbitrary code.
 - An unspecified flaw exists that is triggered when handling WebGL texture images. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A use-after-free flaw exists in the 'nsDocShell::~nsDocShell()' function in 'docshell/base/nsDocShell.cpp' that is triggered when notifying observers. This may allow a context-dependent attacker to dereference already freed memory and potentially execute arbitrary code.
 - A flaw exists in the 'CleanupOSFileConstants()' function in 'dom/system/OSFileConstants.cpp' related to use of uninitialized memory. This may allow a context-dependent attacker to potentially execute arbitrary code.
 - A flaw exists in the 'ApplicationReputationService::~ApplicationReputationService()' function in 'toolkit/components/downloads/ApplicationReputation.cpp' that is triggered as certain pointers are not properly cleared. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'EnumerableOwnProperties()' function in 'js/src/builtin/Object.cpp' that is triggered when rooting objects. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A use-after-free flaw exists in the 'CompositorBridgeChild::RecvDidComposite()' function in 'gfx/layers/ipc/CompositorBridgeChild.cpp' that is triggered when handling texture pools. This may allow a context-dependent attacker to dereference already freed memory and potentially execute arbitrary code.
 - A flaw exists in the 'nsViewManager::~nsViewManager()' function in 'view/nsViewManager.cpp' that is triggered as the PresShell object is not properly handled. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'TLSFilterTransaction::Close()' function in 'netwerk/protocol/http/TunnelUtils.cpp' that is triggered as timers are not properly handled when a transaction is canceled. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'EventStateManager::DispatchCrossProcessEvent()' function in 'dom/events/EventStateManager.cpp' that is triggered when handling drag events. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A flaw exists in the 'nsNodeUtils::CloneAndAdopt()' function in 'dom/base/nsNodeUtils.cpp' that is triggered when handling properties of adopted nodes. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A type confusion flaw exists in the 'PropertyReadNeedsTypeBarrier()' function in 'jit/MIR.cpp' that is triggered as certain input is not properly validated. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A logic flaw exists in the 'IsMarkedBlack()' function in 'js/src/gc/Barrier.cpp' that is triggered during gray marking asserts. This may allow a context-dependent attacker to corrupt memory and potentially execute arbitrary code.
 - A use-after-free error exists that triggered when flushing and resizing the layout, which may cause the PressShell object to be freed while still in use. This may allow a context-dependent attacker to potentially execute arbitrary code.
 - A flaw exists in the 'HttpBaseChannel::GetPerformance()' function in 'netwerk/protocol/http/HttpBaseChannel.cpp' that is triggered as navigations in cross-origin iframes are revealed. Using the Resource Timing API, a context-dependent attacker to gain access to cross-origin URL information.
 - A flaw exists that is triggered as the security wrapper fails to deny access to certain exposed properties using the deprecated exposedProps mechanism on proxy objects. This may allow a context-dependent attacker to gain access to potentially sensitive information.
 - A flaw exists in the 'nsIDNService::isLabelSafe()' function in 'netwerk/dns/nsIDNService.cpp' that is triggered during the handling of the combined, single character, version of the letter 'i' with any of the potential accents in unicode, such as acute or grave. This combinations do not display properly in punycode. With a specially crafted domain including a dotless version of  'i', a context-dependent attacker can spoof a domain.
 - A flaw exists in the 'nsIDNService::isLabelSafe()' function in 'netwerk/dns/nsIDNService.cpp' that is triggered during the handling of Arabic and Indic vowel marker characters that are combined with Latin characters in a domain name, which can cause the non-latin characters to be eclipsed in the address bar. This may allow a context-dependent attacker to spoof a domain.
 - A flaw exists that is triggered as data: URLs loaded into new tabs do not properly inherit the Content Security Policy (CSP) of the original page. This may allow a context-dependent attacker to bypass protection mechanisms.
 - A flaw exists in the 'nsMixedContentBlocker::AsyncOnChannelRedirect()' function in 'dom/security/nsMixedContentBlocker.cpp' that is triggered as mixed content blocking was not properly applied to resources when being redirected from an HTTPS environment to an HTTP environment. This may allow a context-dependent attacker to bypass restricts and load blocked content on pages.
 - A flaw exists in the 'CurlWrapper::Init()' function in 'toolkit/components/telemetry/pingsender/pingsender_unix_common.cpp' that is triggered as it fails to validate the libcurl library before loading it. This may allow a local attacker to replace libcurl files and gain elevated privileges.
 - A flaw exists in the 'nsContentSink::ProcessMETATag()' function in 'dom/base/nsContentSink.cpp' that is triggered during the handling of <meta> tags in SVG passed via <img> tags. This may allow a context-dependent attacker to set cookies for a page.
 - A flaw exists in 'netwerk/dns/nsIDNService.cpp' that is triggered as Punycode format text is not properly displayed in international domain names when triggered by a sub-domain. This may allow a context-dependent attacker to conduct a limited spoofing attack.
 - A flaw exists in the 'stripUnsafeProtocolOnPaste()' function in 'base/content/browser.js' that is triggered during the handling of control characters before javascript: URLs. This may allow a context-dependent attacker to bypass self-XSS protection mechanisms.
 - A flaw exists in the '_writeItem()' function in 'toolkit/components/places/BookmarkHTMLUtils.jsm' that allows a cross-site scripting (self-XSS) attack. This flaw exists exists because the program does not validate input to exported bookmarks before returning it to users. This may allow a context-dependent attacker to create a specially crafted request that would execute arbitrary script code in their own browser.
 - A flaw exists that is triggered as the referrer policy is not always honored when handling <link> elements. This may allow a context-dependent attacker to bypass the referrer policy.
 - A flaw exists in the 'PerDocumentStyleDataImpl::visited_styles_enabled()' function in 'servo/components/style/gecko/data.rs'. The issue is triggered when handling the CSS ':visited' selector for a document being used as an SVG image. With a specially crafted web page, a context-dependent attacker disclose visited history information.
 - A flaw exists in the 'FactoryOp::CheckPermission()' function in 'dom/indexedDB/ActorsParent.cpp' that is triggered as a web worker in Private Browsing mode can write to IndexedDB. With a specially crafted web page, a context-dependent attacker can uniquely fingerprint a user even when browsing in Private Browsing mode.
 - An overflow condition exists that is triggered as certain input is not properly validated when drawing and validating elements using Direct 3D 9 with the ANGLE graphics library. This may allow a context-dependent attacker to cause a buffer overflow and potentially execute arbitrary code.
 - A flaw exists related to speculative execution, which is used as a performance feature to speed up operations. This optimization can result in memory being cached during conditional branches handling out-of-bounds checks. Using a vulnerable code pattern, or a JIT engine or interpreter to generate such a pattern, an attacker can perform a Flush+Reload or Evict+Reload side-channel attack on the cache and disclose parts of the privileged kernel memory.
 - A flaw exists in the fundamental design related to out-of-order process execution, which is used as a performance feature to speed up operations. This optimization can result in memory being cached before exceptions are raised for restricted memory access. Using transient instructions in combination with a Flush+Reload side-channel attack a local attacker can disclose parts of the privileged kernel memory.
 - A flaw exists related to speculative execution, which is used as a performance feature to speed up operations. This optimization can result in memory being cached during indirect branch prediction. This may allow a local attacker to train the Branch Target Buffer (BTB) to trigger a false prediction to a specially crafted memory location, causing a speculative execution of a crafted gadget and the caching of arbitrary memory. Using a side-channel attack on the cache the attacker can disclose parts of the privileged kernel memory.

The version of Firefox installed on the remote Windows host is prior to 57.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2017-24 advisory.

  - Mozilla developers and community members Boris Zbarsky, Carsten Book, Christian Holler, Byron Campen, Jan     de Mooij, Jason Kratzer, Jesse Schwartzentruber, Marcia Knous, Randell Jesup, Tyson Smith, and Ting-Yu     Chou reported memory safety bugs present in Firefox 56. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort that some of these could be exploited to run arbitrary     code. (CVE-2017-7827)

  - A use-after-free vulnerability can occur when flushing and resizing layout because the     <code>PressShell</code> object has been freed while still in use. This results in a potentially     exploitable crash during these operations. (CVE-2017-7828)

  - The Resource Timing API incorrectly revealed navigations in cross-origin iframes. This is a same-origin     policy violation and could allow for data theft of URLs loaded by users. (CVE-2017-7830)

  - A vulnerability where the security wrapper does not deny access to some exposed properties using the     deprecated <code>exposedProps</code> mechanism on proxy objects. These properties should be explicitly     unavailable to proxy objects. (CVE-2017-7831)

  - The combined, single character, version of the letter 'i' with any of the potential accents in unicode,     such as acute or grave, can be spoofed in the addressbar by the dotless version of 'i' followed by the     same accent as a second character with most font sets. This allows for domain spoofing attacks because     these combined domain names do not display as punycode. (CVE-2017-7832)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Mozilla Firefox installed on the remote macOS or Mac OS X host is prior to 57. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable application crashes.

The version of Mozilla Firefox ESR installed on the remote macOS or Mac OS X host is prior to 52.5. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes.

Mozilla Foundation reports :

CVE-2017-7828: Use-after-free of PressShell while restyling layout

CVE-2017-7830: Cross-origin URL information leak through Resource Timing API

CVE-2017-7831: Information disclosure of exposed properties on JavaScript proxy objects

CVE-2017-7832: Domain spoofing through use of dotless 'i' character followed by accent markers

CVE-2017-7833: Domain spoofing with Arabic and Indic vowel marker characters

CVE-2017-7834: data: URLs opened in new tabs bypass CSP protections

CVE-2017-7835: Mixed content blocking incorrectly applies with redirects

CVE-2017-7836: Pingsender dynamically loads libcurl on Linux and OS X

CVE-2017-7837: SVG loaded as <img> can use meta tags to set cookies

CVE-2017-7838: Failure of individual decoding of labels in international domain names triggers punycode display of entire IDN

CVE-2017-7839: Control characters before javascript: URLs defeats self-XSS prevention mechanism

CVE-2017-7840: Exported bookmarks do not strip script elements from user-supplied tags

CVE-2017-7842: Referrer Policy is not always respected for <link> elements

CVE-2017-7827: Memory safety bugs fixed in Firefox 57

CVE-2017-7826: Memory safety bugs fixed in Firefox 57 and Firefox ESR 52.5

ID	Name	Product	Family	Severity
275659	Mozilla Firefox < 57.0	Nessus	MacOS X Local Security Checks	critical
700322	Mozilla Firefox < 57 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	critical
104638	Mozilla Firefox < 57.0	Nessus	Windows	critical
104636	Mozilla Firefox < 57 Multiple Vulnerabilities (macOS)	Nessus	MacOS X Local Security Checks	critical
104635	Mozilla Firefox ESR < 52.5 Multiple Vulnerabilities (macOS)	Nessus	MacOS X Local Security Checks	critical
104564	FreeBSD : mozilla -- multiple vulnerabilities (f78eac48-c3d1-4666-8de5-63ceea25a578)	Nessus	FreeBSD Local Security Checks	critical

Detections

Analytics

CVE-2017-7836

high

Tenable Plugins

critical

critical

critical

critical

critical

critical