CVE-2021-38502

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 91.2.0.

Security Fix(es):

• Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

• Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2 (CVE-2021-38500)

• Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)

• Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

• rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)

• Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)

• Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

Updated thunderbird packages fix security vulnerabilities:

Due to a data race in the crossbeam-deque in the crossbeam crate, one or more tasks in the worker queue could have been be popped twice instead of other tasks that are forgotten and never popped. If tasks are allocated on the heap, this could have caused a double free and a memory leak (CVE-2021-32810).

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash due to a use-after-free in MessageTask (CVE-2021-38496).

Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another origin, leading to possible user confusion and spoofing attacks (CVE-2021-38497).

During process shutdown, a document could have caused a use-after-free of a languages service object (nsLanguageAtomService), leading to memory corruption and a potentially exploitable crash (CVE-2021-38498).

Mozilla developers and community members Andreas Pehrson, Christian Holler, Kevin Brosnan, and Mihai Alexandru Michis reported memory safety bugs present in Thunderbird 91.1. 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-2021-38500, CVE-2021-38501).

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too (CVE-2021-38502).

This update for MozillaThunderbird fixes the following issues:

• Update to version 91.4 MFSA 2021-54 (bsc#1193485)

• CVE-2021-43536: URL leakage when navigating while executing asynchronous function

• CVE-2021-43537: Heap buffer overflow when using structured clone

• CVE-2021-43538: Missing fullscreen and pointer lock notification when requesting both

• CVE-2021-43539: GC rooting failure when calling wasm instance methods

• CVE-2021-43541: External protocol handler parameters were unescaped

• CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence of an external protocol handler

• CVE-2021-43543: Bypass of CSP sandbox directive when embedding

• CVE-2021-43545: Denial of Service when using the Location API in a loop

• CVE-2021-43546: Cursor spoofing could overlay user interface when native cursor is zoomed

• CVE-2021-43528: JavaScript unexpectedly enabled for the composition area

• Update to version 91.3.2

• CVE-2021-40529: Fixed ElGamal implementation could allow plaintext recovery (bsc#1190244)

• Update to version 91.3 MFSA 2021-50 (bsc#1192250)

• CVE-2021-38503: Fixed iframe sandbox rules did not apply to XSLT stylesheets

• CVE-2021-38504: Fixed use-after-free in file picker dialog

• CVE-2021-38505: Fixed Windows 10 Cloud Clipboard may have recorded sensitive user data

• CVE-2021-38506: Fixed Thunderbird could be coaxed into going into fullscreen mode without notification or warning

• CVE-2021-38507: Fixed opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports

• CVE-2021-38508: Fixed permission Prompt could be overlaid, resulting in user confusion and potential spoofing

• CVE-2021-38509: Fixed Javascript alert box could have been spoofed onto an arbitrary domain

• CVE-2021-38510: Fixed Download Protections were bypassed by .inetloc files on Mac OS

• Fixed plain text reformatting regression (bsc#1182863)

• Update to version 91.2 MFSA 2021-47 (bsc#1191332)

• CVE-2021-29981: Live range splitting could have led to conflicting assignments in the JIT

• CVE-2021-29982: Single bit data leak due to incorrect JIT optimization and type confusion

• CVE-2021-29987: Users could have been tricked into accepting unwanted permissions on Linux

• CVE-2021-32810: Data race in crossbeam-deque

• CVE-2021-38493: Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird 91.1

• CVE-2021-38496: Use-after-free in MessageTask

• CVE-2021-38497: Validation message could have been overlaid on another origin

• CVE-2021-38498: Use-after-free of nsLanguageAtomService object

• CVE-2021-38500: Memory safety bugs fixed in Thunderbird 91.2

• CVE-2021-38501: Memory safety bugs fixed in Thunderbird 91.2

• CVE-2021-38502: Downgrade attack on SMTP STARTTLS connections

• Update to version 91.1.0 MFSA 2021-41 (bsc#1190269)

• CVE-2021-38492: Navigating to mk: URL scheme could load Internet Explorer

• CVE-2021-38495: Memory safety bugs fixed in Thunderbird 91.1

• Update to version 91.0.1 MFSA 2021-37 (bsc#1189547)

• CVE-2021-29991: Header Splitting possible with HTTP/3 Responses

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

This update for MozillaThunderbird fixes the following issues:

• Update to version 91.4 MFSA 2021-54 (bsc#1193485)

• CVE-2021-43536: URL leakage when navigating while executing asynchronous function

• CVE-2021-43537: Heap buffer overflow when using structured clone

• CVE-2021-43538: Missing fullscreen and pointer lock notification when requesting both

• CVE-2021-43539: GC rooting failure when calling wasm instance methods

• CVE-2021-43541: External protocol handler parameters were unescaped

• CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence of an external protocol handler

• CVE-2021-43543: Bypass of CSP sandbox directive when embedding

• CVE-2021-43545: Denial of Service when using the Location API in a loop

• CVE-2021-43546: Cursor spoofing could overlay user interface when native cursor is zoomed

• CVE-2021-43528: JavaScript unexpectedly enabled for the composition area

• Update to version 91.3.2

• CVE-2021-40529: Fixed ElGamal implementation could allow plaintext recovery (bsc#1190244)

• Update to version 91.3 MFSA 2021-50 (bsc#1192250)

• CVE-2021-38503: Fixed iframe sandbox rules did not apply to XSLT stylesheets

• CVE-2021-38504: Fixed use-after-free in file picker dialog

• CVE-2021-38505: Fixed Windows 10 Cloud Clipboard may have recorded sensitive user data

• CVE-2021-38506: Fixed Thunderbird could be coaxed into going into fullscreen mode without notification or warning

• CVE-2021-38507: Fixed opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports

• CVE-2021-38508: Fixed permission Prompt could be overlaid, resulting in user confusion and potential spoofing

• CVE-2021-38509: Fixed Javascript alert box could have been spoofed onto an arbitrary domain

• CVE-2021-38510: Fixed Download Protections were bypassed by .inetloc files on Mac OS

• Fixed plain text reformatting regression (bsc#1182863)

• Update to version 91.2 MFSA 2021-47 (bsc#1191332)

• CVE-2021-29981: Live range splitting could have led to conflicting assignments in the JIT

• CVE-2021-29982: Single bit data leak due to incorrect JIT optimization and type confusion

• CVE-2021-29987: Users could have been tricked into accepting unwanted permissions on Linux

• CVE-2021-32810: Data race in crossbeam-deque

• CVE-2021-38493: Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird 91.1

• CVE-2021-38496: Use-after-free in MessageTask

• CVE-2021-38497: Validation message could have been overlaid on another origin

• CVE-2021-38498: Use-after-free of nsLanguageAtomService object

• CVE-2021-38500: Memory safety bugs fixed in Thunderbird 91.2

• CVE-2021-38501: Memory safety bugs fixed in Thunderbird 91.2

• CVE-2021-38502: Downgrade attack on SMTP STARTTLS connections

• Update to version 91.1.0 MFSA 2021-41 (bsc#1190269)

• CVE-2021-38492: Navigating to mk: URL scheme could load Internet Explorer

• CVE-2021-38495: Memory safety bugs fixed in Thunderbird 91.1

• Update to version 91.0.1 MFSA 2021-37 (bsc#1189547)

• CVE-2021-29991: Header Splitting possible with HTTP/3 Responses

This update for MozillaThunderbird fixes the following issues:

• Update to version 91.4 MFSA 2021-54 (bsc#1193485)

• CVE-2021-43536: URL leakage when navigating while executing asynchronous function

• CVE-2021-43537: Heap buffer overflow when using structured clone

• CVE-2021-43538: Missing fullscreen and pointer lock notification when requesting both

• CVE-2021-43539: GC rooting failure when calling wasm instance methods

• CVE-2021-43541: External protocol handler parameters were unescaped

• CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence of an external protocol handler

• CVE-2021-43543: Bypass of CSP sandbox directive when embedding

• CVE-2021-43545: Denial of Service when using the Location API in a loop

• CVE-2021-43546: Cursor spoofing could overlay user interface when native cursor is zoomed

• CVE-2021-43528: JavaScript unexpectedly enabled for the composition area

• Update to version 91.3.2

• CVE-2021-40529: Fixed ElGamal implementation could allow plaintext recovery (bsc#1190244)

• Update to version 91.3 MFSA 2021-50 (bsc#1192250)

• CVE-2021-38503: Fixed iframe sandbox rules did not apply to XSLT stylesheets

• CVE-2021-38504: Fixed use-after-free in file picker dialog

• CVE-2021-38505: Fixed Windows 10 Cloud Clipboard may have recorded sensitive user data

• CVE-2021-38506: Fixed Thunderbird could be coaxed into going into fullscreen mode without notification or warning

• CVE-2021-38507: Fixed opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports

• CVE-2021-38508: Fixed permission Prompt could be overlaid, resulting in user confusion and potential spoofing

• CVE-2021-38509: Fixed Javascript alert box could have been spoofed onto an arbitrary domain

• CVE-2021-38510: Fixed Download Protections were bypassed by .inetloc files on Mac OS

• Fixed plain text reformatting regression (bsc#1182863)

• Update to version 91.2 MFSA 2021-47 (bsc#1191332)

• CVE-2021-29981: Live range splitting could have led to conflicting assignments in the JIT

• CVE-2021-29982: Single bit data leak due to incorrect JIT optimization and type confusion

• CVE-2021-29987: Users could have been tricked into accepting unwanted permissions on Linux

• CVE-2021-32810: Data race in crossbeam-deque

• CVE-2021-38493: Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird 91.1

• CVE-2021-38496: Use-after-free in MessageTask

• CVE-2021-38497: Validation message could have been overlaid on another origin

• CVE-2021-38498: Use-after-free of nsLanguageAtomService object

• CVE-2021-38500: Memory safety bugs fixed in Thunderbird 91.2

• CVE-2021-38501: Memory safety bugs fixed in Thunderbird 91.2

• CVE-2021-38502: Downgrade attack on SMTP STARTTLS connections

• Update to version 91.1.0 MFSA 2021-41 (bsc#1190269)

• CVE-2021-38492: Navigating to mk: URL scheme could load Internet Explorer

• CVE-2021-38495: Memory safety bugs fixed in Thunderbird 91.1

• Update to version 91.0.1 MFSA 2021-37 (bsc#1189547)

• CVE-2021-29991: Header Splitting possible with HTTP/3 Responses

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, trick a user into accepting unwanted permissions, conduct header splitting attacks, conduct spoofing attacks, bypass security restrictions, confuse the user, or execute arbitrary code. (CVE-2021-4129, CVE-2021-4140, CVE-2021-29981, CVE-2021-29982, CVE-2021-29987, CVE-2021-29991, CVE-2021-38495, CVE-2021-38496, CVE-2021-38497, CVE-2021-38498, CVE-2021-38500, CVE-2021-38501, CVE-2021-38503, CVE-2021-38504, CVE-2021-38506, CVE-2021-38507, CVE-2021-38508, CVE-2021-38509, CVE-2021-43534, CVE-2021-43535, CVE-2021-43536, CVE-2021-43537, CVE-2021-43538, CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543, CVE-2021-43545, CVE-2021-43656, CVE-2022-22737, CVE-2022-22738, CVE-2022-22739, CVE-2022-22740, CVE-2022-22741, CVE-2022-22742, CVE-2022-22743, CVE-2022-22745, CVE-2022-22747, CVE-2022-22748, CVE-2022-22751)

It was discovered that Thunderbird ignored the configuration to require STARTTLS for an SMTP connection. A person-in-the-middle could potentially exploit this to perform a downgrade attack in order to intercept messages or take control of a session. (CVE-2021-38502)

It was discovered that JavaScript was unexpectedly enabled in the composition area. An attacker could potentially exploit this in combination with another vulnerability, with unspecified impacts. (CVE-2021-43528)

A buffer overflow was discovered in the Matrix chat library bundled with Thunderbird. An attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-44538)

It was discovered that Thunderbird's OpenPGP integration only considered the inner signed message when checking signature validity in a message that contains an additional outer MIME layer. An attacker could potentially exploit this to trick the user into thinking that a message has a valid signature. (CVE-2021-4126)