CVE-2021-23999

If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

Mozilla Firefox is a standalone web browser, designed for standards compliance and performance. Its functionality can be enhanced via a plethora of extensions.

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability.

Security Fix(es):

Mozilla developers reported memory safety bugs present in Firefox for Android 79. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.(CVE-2020-15670)

Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.(CVE-2020-15673)

Mozilla developers reported memory safety bugs present in Firefox 80. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 81.(CVE-2020-15674)

When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 81.(CVE-2020-15675)

If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.(CVE-2020-15680)

When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 82.(CVE-2020-15681)

When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. This vulnerability affects Firefox < 82.(CVE-2020-15682)

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.(CVE-2020-15683)

Mozilla developers reported memory safety bugs present in Firefox 81. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 82.(CVE-2020-15684)

Side-channel information leakage in graphics in Google Chrome prior to 87.0.4280.66 allowed a remote attacker to leak cross-origin data via a crafted HTML page.(CVE-2020-16012)

Use after free in WebRTC in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to potentially exploit heap corruption via a crafted SCTP packet.(CVE-2020-16044)

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.(CVE-2020-26950)

(CVE-2020-26951)

(CVE-2020-26953) …

Mozilla Firefox is a standalone web browser, designed for standards compliance and performance. Its functionality can be enhanced via a plethora of extensions.

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability.

Security Fix(es):

Mozilla developers reported memory safety bugs present in Firefox for Android 79. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.(CVE-2020-15670)

Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.(CVE-2020-15673)

Mozilla developers reported memory safety bugs present in Firefox 80. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 81.(CVE-2020-15674)

When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 81.(CVE-2020-15675)

If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.(CVE-2020-15680)

When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 82.(CVE-2020-15681)

When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. This vulnerability affects Firefox < 82.(CVE-2020-15682)

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.(CVE-2020-15683)

Mozilla developers reported memory safety bugs present in Firefox 81. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 82.(CVE-2020-15684)

Side-channel information leakage in graphics in Google Chrome prior to 87.0.4280.66 allowed a remote attacker to leak cross-origin data via a crafted HTML page.(CVE-2020-16012)

Use after free in WebRTC in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to potentially exploit heap corruption via a crafted SCTP packet.(CVE-2020-16044)

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.(CVE-2020-26950)

(CVE-2020-26951)

(CVE-2020-26953) …

If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

More internal network hosts could have been probed by a malicious webpage: Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine (CVE-2021-23961).

Out of bound write due to lazy initialization: A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound write (CVE-2021-23994).

Use-after-free in Responsive Design Mode: When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code (CVE-2021-23995).

Secure Lock icon could have been spoofed: Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page (CVE-2021-23998).

Blob URLs may have been granted additional privileges: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content (CVE-2021-23999).

Arbitrary FTP command execution on FTP servers using an encoded URL: When a user clicked on an FTP URL containing encoded newline characters (%0A and %0D), the newlines would have been interpreted as such and allowed arbitrary commands to be sent to the FTP server (CVE-2021-24002).

Incorrect size computation in WebAssembly JIT could lead to null-reads: The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. Note: This issue only affected x86-32 platforms. Other platforms are unaffected. (CVE-2021-29945).

Port blocking could be bypassed: Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header (CVE-2021-29946).

Race condition when reading from disk while verifying signatures: Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file (CVE-2021-29948).

More internal network hosts could have been probed by a malicious webpage: Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine (CVE-2021-23961).

Out of bound write due to lazy initialization: A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound write (CVE-2021-23994).

Use-after-free in Responsive Design Mode: When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code (CVE-2021-23995).

Secure Lock icon could have been spoofed: Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page (CVE-2021-23998).

Blob URLs may have been granted additional privileges: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content (CVE-2021-23999).

Arbitrary FTP command execution on FTP servers using an encoded URL: When a user clicked on an FTP URL containing encoded newline characters (%0A and %0D), the newlines would have been interpreted as such and allowed arbitrary commands to be sent to the FTP server (CVE-2021-24002).

Incorrect size computation in WebAssembly JIT could lead to null-reads: The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. Note: This issue only affected x86-32 platforms. Other platforms are unaffected. (CVE-2021-29945).

Port blocking could be bypassed: Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header (CVE-2021-29946).

This update for MozillaFirefox fixes the following issues:

• Firefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for MozillaThunderbird fixes the following issues:

• Firefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed
  • CVE-2021-29948: Race condition when reading from disk while verifying signatures

This update was imported from the SUSE:SLE-15-SP2:Update update project.

These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the MozillaThunderbird-91.1.1-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

This update for MozillaFirefox fixes the following issues:

• Firefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed

This update for MozillaFirefox fixes the following issues:

• Firefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed

This update for MozillaThunderbird fixes the following issues:

• Firefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed
  • CVE-2021-29948: Race condition when reading from disk while verifying signatures

This update for MozillaFirefox fixes the following issues:

• MozillaFirefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed

This update for MozillaFirefox fixes the following issues:

• Firefox was updated to 78.10.0 ESR (bsc#1184960)
  • CVE-2021-23994: Out of bound write due to lazy initialization
  • CVE-2021-23995: Use-after-free in Responsive Design Mode
  • CVE-2021-23998: Secure Lock icon could have been spoofed
  • CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage
  • CVE-2021-23999: Blob URLs may have been granted additional privileges
  • CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL
  • CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads
  • CVE-2021-29946: Port blocking could be bypassed

Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the browser UI, bypass security restrictions, trick the user into disclosing confidential information, or execute arbitrary code. (CVE-2021-23994, CVE-2021-23996, CVE-2021-23997, CVE-2021-23998, CVE-2021-23999, CVE-2021-24000, CVE-2021-24001, CVE-2021-29945, CVE-2021-29946, CVE-2021-29947)

A use-after-free was discovered when Responsive Design Mode was enabled. If a user were tricked into opening a specially crafted website with Responsive Design Mode enabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-23995)

It was discovered that Firefox mishandled ftp URLs with encoded newline characters. If a user were tricked into clicking on a specially crafted link, an attacker could potentially exploit this to send arbitrary FTP commands. (CVE-2021-24002)

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, spoof the UI, bypass security restrictions, or execute arbitrary code. (CVE-2021-23961, CVE-2021-23981, CVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998, CVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)

It was discovered that extensions could open popup windows with control of the window title in some circumstances. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to spoof a website and trick the user into providing credentials. (CVE-2021-23984)

Multiple security issues were discovered in Thunderbird's OpenPGP integration. If a user were tricked into importing a specially crafted key in some circumstances, an attacker could potentially exploit this to cause a denial of service (inability to send encrypted email) or confuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)

A use-after-free was discovered when Responsive Design Mode was enabled. If a user were tricked into opening a specially crafted website with Responsive Design Mode enabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-23995)

It was discovered that Thunderbird mishandled ftp URLs with encoded newline characters. If a user were tricked into clicking on a specially crafted link, an attacker could potentially exploit this to send arbitrary FTP commands. (CVE-2021-24002)

It was discovered that Thunderbird wrote signatures to disk and read them back during verification. A local attacker could potentially exploit this to replace the data with another signature file. (CVE-2021-29948)

It was discovered that Thunderbird might load an alternative OTR library. If a user were tricked into copying a specially crafted library to one of Thunderbird's search paths, an attacker could potentially exploit this to execute arbitrary code. (CVE-2021-29949)

It was discovered that secret keys imported into Thunderbird were stored unencrypted. A local attacker could potentially exploit this to obtain private keys. (CVE-2021-29956)

It was discovered that Thunderbird did not indicate when an inline signed or encrypted message contained additional unprotected parts. (CVE-2021-29957)

USN-4995-1 fixed vulnerabilities in Thunderbird. This update provides the corresponding updates for Ubuntu 18.04 LTS.

Original advisory details:

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, spoof the UI, bypass security restrictions, or execute arbitrary code. (CVE-2021-23961, CVE-2021-23981, CVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998, CVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)

It was discovered that extensions could open popup windows with control of the window title in some circumstances. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to spoof a website and trick the user into providing credentials. (CVE-2021-23984)

Multiple security issues were discovered in Thunderbird's OpenPGP integration. If a user were tricked into importing a specially crafted key in some circumstances, an attacker could potentially exploit this to cause a denial of service (inability to send encrypted email) or confuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)

A use-after-free was discovered when Responsive Design Mode was enabled. If a user were tricked into opening a specially crafted website with Responsive Design Mode enabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-23995)

It was discovered that Thunderbird mishandled ftp URLs with encoded newline characters. If a user were tricked into clicking on a specially crafted link, an attacker could potentially exploit this to send arbitrary FTP commands. (CVE-2021-24002)

It was discovered that Thunderbird wrote signatures to disk and read them back during verification. A local attacker could potentially exploit this to replace the data with another signature file. (CVE-2021-29948)

It was discovered that Thunderbird might load an alternative OTR library. If a user were tricked into copying a specially crafted library to one of Thunderbird's search paths, an attacker could potentially exploit this to execute arbitrary code. (CVE-2021-29949)

It was discovered that secret keys imported into Thunderbird were stored unencrypted. A local attacker could potentially exploit this to obtain private keys. (CVE-2021-29956)

It was discovered that Thunderbird did not indicate when an inline signed or encrypted message contained additional unprotected parts. (CVE-2021-29957)