CVE-2020-6821

When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Updated firefox packages fix security vulnerabilities:

When reading from areas partially or fully outside the source resource with WebGL's copyTexSubImage method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure (CVE-2020-6821).

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in GMPDecodeData. It is possible that with enough effort this could have been exploited to run arbitrary code (CVE-2020-6822).

Mozilla developers Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR 68.6. 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 (CVE-2020-6825).

The updated packages fix security vulnerabilities:

Use-after-free while running the nsDocShell destructor. (CVE-2020-6819)

Use-after-free when handling a ReadableStream. (CVE-2020-6820)

Uninitialized memory could be read when using the WebGL copyTexSubImage method. (CVE-2020-6821)

Out of bounds write in GMPDecodeData when processing large images. (CVE-2020-6822)

Memory safety bugs fixed in Thunderbird 68.7.0. (CVE-2020-6825)

This update for MozillaFirefox to version 68.7.0 ESR fixes the following issues:

• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage method (bsc#1168874).
• CVE-2020-6822: Fixed out of bounds write in GMPDecodeData when processing large images (bsc#1168874).
• CVE-2020-6825: Fixed Memory safety bugs (bsc#1168874).
• CVE-2020-6827: Custom Tabs could have the URI spoofed (bsc#1168874).
• CVE-2020-6828: Preference overwrite via crafted Intent (bsc#1168874).

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

This update for MozillaThunderbird to version 68.7.0 fixes the following issues:

• CVE-2020-6819: Use-after-free while running the nsDocShell destructor (boo#1168630)
• CVE-2020-6820: Use-after-free when handling a ReadableStream (boo#1168630)
• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage() (boo#1168874)
• CVE-2020-6822: Out of bounds write in GMPDecodeData when processing large images (boo#1168874)
• CVE-2020-6825: Memory safety bugs fixed (boo#1168874)

This update for MozillaThunderbird to version 68.7.0 fixes the following issues:

• CVE-2020-6819: Use-after-free while running the nsDocShell destructor (boo#1168630)
• CVE-2020-6820: Use-after-free when handling a ReadableStream (boo#1168630)
• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage() (boo#1168874)
• CVE-2020-6822: Out of bounds write in GMPDecodeData when processing large images (boo#1168874)
• CVE-2020-6825: Memory safety bugs fixed (boo#1168874)

This update was imported from the SUSE:SLE-15: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 to version 68.7.0 ESR fixes the following issues:

• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage method (bsc#1168874).
• CVE-2020-6822: Fixed out of bounds write in GMPDecodeData when processing large images (bsc#1168874).
• CVE-2020-6825: Fixed Memory safety bugs (bsc#1168874).
• CVE-2020-6827: Custom Tabs could have the URI spoofed (bsc#1168874).
• CVE-2020-6828: Preference overwrite via crafted Intent (bsc#1168874).

This update for MozillaFirefox to version 68.7.0 ESR fixes the following issues:

• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage method (bsc#1168874).
• CVE-2020-6822: Fixed out of bounds write in GMPDecodeData when processing large images (bsc#1168874).
• CVE-2020-6825: Fixed Memory safety bugs (bsc#1168874).
• CVE-2020-6827: Custom Tabs could have the URI spoofed (bsc#1168874).
• CVE-2020-6828: Preference overwrite via crafted Intent (bsc#1168874).

This update for MozillaThunderbird to version 68.7.0 fixes the following issues:

• CVE-2020-6819: Use-after-free while running the nsDocShell destructor (boo#1168630)
• CVE-2020-6820: Use-after-free when handling a ReadableStream (boo#1168630)
• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage() (boo#1168874)
• CVE-2020-6822: Out of bounds write in GMPDecodeData when processing large images (boo#1168874)
• CVE-2020-6825: Memory safety bugs fixed (boo#1168874)

This update for MozillaFirefox to version 68.7.0 ESR fixes the following issues:

• CVE-2020-6821: Uninitialized memory could be read when using the WebGL copyTexSubImage method (bsc#1168874).
• CVE-2020-6822: Fixed out of bounds write in GMPDecodeData when processing large images (bsc#1168874).
• CVE-2020-6825: Fixed Memory safety bugs (bsc#1168874).
• CVE-2020-6827: Custom Tabs could have the URI spoofed (bsc#1168874).
• CVE-2020-6828: Preference overwrite via crafted Intent (bsc#1168874).

Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, or execute arbitrary code. (CVE-2020-6821, CVE-2020-6822, CVE-2020-6824, CVE-2020-6825, CVE-2020-6826)

It was discovered that extensions could obtain auth codes from OAuth login flows in some circumstances. If a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit this to obtain access to the user's account. (CVE-2020-6823)

It was discovered that Message ID calculation was based on uninitialized data. An attacker could potentially exploit this to obtain sensitive information. (CVE-2020-6792)

Mutiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, or execute arbitrary code. (CVE-2020-6793, CVE-2020-6795, CVE-2020-6822)

It was discovered that if a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy of these passwords would still be accessible. A local user could exploit this to obtain sensitive information. (CVE-2020-6794)

Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, conduct cross-site scripting (XSS) attacks, obtain sensitive information, or execute arbitrary code. (CVE-2019-20503, CVE-2020-6798, CVE-2020-6800, CVE-2020-6805, CVE-2020-6806, CVE-2020-6807, CVE-2020-6812, CVE-2020-6814, CVE-2020-6819, CVE-2020-6820, CVE-2020-6821, CVE-2020-6825)

It was discovered that the Devtools’ ‘Copy as cURL’ feature did not fully escape website-controlled data. If a user were tricked in to using the ‘Copy as cURL’ feature to copy and paste a command with specially crafted data in to a terminal, an attacker could potentially exploit this to execute arbitrary commands via command injection. (CVE-2020-6811)

Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, bypass security restrictions, bypass same-origin restrictions, conduct cross-site scripting (XSS) attacks, or execute arbitrary code. (CVE-2019-11757, CVE-2019-11758, CVE-2019-11759, CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764, CVE-2019-17005, CVE-2019-17008, CVE-2019-17010, CVE-2019-17011, CVE-2019-17012, CVE-2019-17016, CVE-2019-17017, CVE-2019-17022, CVE-2019-17024, CVE-2019-17026, CVE-2019-20503, CVE-2020-6798, CVE-2020-6800, CVE-2020-6805, CVE-2020-6806, CVE-2020-6807, CVE-2020-6812, CVE-2020-6814, CVE-2020-6819, CVE-2020-6820, CVE-2020-6821, CVE-2020-6825)

It was discovered that NSS incorrectly handled certain memory operations. A remote attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2019-11745)

It was discovered that a specially crafted S/MIME message with an inner encryption layer could be displayed as having a valid signature in some circumstances, even if the signer had no access to the encrypted message. An attacker could potentially exploit this to spoof the message author. (CVE-2019-11755)

A heap overflow was discovered in the expat library in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2019-15903)

It was discovered that Message ID calculation was based on uninitialized data. An attacker could potentially exploit this to obtain sensitive information. (CVE-2020-6792)

Mutiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, or execute arbitrary code. (CVE-2020-6793, CVE-2020-6795, CVE-2020-6822)

It was discovered that if a user saved passwords before Thunderbird 60 and then later set a primary password, an unencrypted copy of these passwords would still be accessible. A local user could exploit this to obtain sensitive information. (CVE-2020-6794)

It was discovered that the Devtools’ ‘Copy as cURL’ feature did not fully escape website-controlled data. If a user were tricked in to using the ‘Copy as cURL’ feature to copy and paste a command with specially crafted data in to a terminal, an attacker could potentially exploit this to execute arbitrary commands via command injection. (CVE-2020-6811)