CVE-2015-2721

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

Several flaws were found in the processing of malformed web content. A web page containing malicious content could cause Firefox to crash or, potentially, execute arbitrary code with the privileges of the user running Firefox (CVE-2015-2722, CVE-2015-2724, CVE-2015-2728, CVE-2015-2733, CVE-2015-2734, CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740).

A flaw was discovered in Mozilla's PDF.js PDF file viewer. When combined with another vulnerability, it could allow execution of arbitrary code with the privileges of the user running Firefox (CVE-2015-2743).

A vulnerability in the TLS protocol allows a man-in-the-middle attacker to downgrade vulnerable TLS connections using ephemeral Diffie-Hellman key exchange to 512-bit export-grade cryptography. This vulnerability is known as Logjam (CVE-2015-4000).

Security researcher Karthikeyan Bhargavan reported an issue in Network Security Services (NSS) where the client allows for a ECDHE_ECDSA exchange where the server does not send its ServerKeyExchange message instead of aborting the handshake. Instead, the NSS client will take the EC key from the ECDSA certificate. This violates the TLS protocol and also has some security implications for forward secrecy. In this situation, the browser thinks it is engaged in an ECDHE exchange, but has been silently downgraded to a non-forward secret mixed-ECDH exchange instead. As a result, if False Start is enabled, the browser will start sending data encrypted under these non-forward-secret connection keys (CVE-2015-2721).

Mozilla community member Watson Ladd reported that the implementation of Elliptical Curve Cryptography (ECC) multiplication for Elliptic Curve Digital Signature Algorithm (ECDSA) signature validation in Network Security Services (NSS) did not handle exceptional cases correctly. This could potentially allow for signature forgery (CVE-2015-2730).

The nss package has been updated to version 3.19.2, which fixes issues related to the minimum key sizes of finite field algorithms, including CVE-2015-4000. It also fixes CVE-2015-2721 and CVE-2015-2730.

The Mageia 4 sqlite3 package has also been updated to version 3.8.10.2, fixing an index corruption issue. Mageia 5 already shipped with version 3.8.10.2.

These are all security issues fixed in the MozillaFirefox-50.1.0-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the MozillaThunderbird-45.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libfreebl3-3.26.2-1.1 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.

MozillaFirefox, mozilla-nspr and mozilla-nss were updated to fix 17 security issues.

For more details please check the changelogs.

These security issues were fixed:

• CVE-2015-2724/CVE-2015-2725/CVE-2015-2726: Miscellaneous memory safety hazards (bsc#935979).
• CVE-2015-2728: Type confusion in Indexed Database Manager (bsc#935979).
• CVE-2015-2730: ECDSA signature validation fails to handle some signatures correctly (bsc#935979).
• CVE-2015-2722/CVE-2015-2733: Use-after-free in workers while using XMLHttpRequest (bsc#935979).
• CVE-2015-2734/CVE-2015-2735/CVE-2015-2736/CVE-2015-2737/CVE-2015-2738/CVE-2015-2739/CVE-2015-2740: Vulnerabilities found through code inspection (bsc#935979).
• CVE-2015-2743: Privilege escalation in PDF.js (bsc#935979).
• CVE-2015-4000: NSS accepts export-length DHE keys with regular DHE cipher suites (bsc#935033).
• CVE-2015-2721: NSS incorrectly permits skipping of ServerKeyExchange (bsc#935979).

This non-security issue was fixed:

• bsc#908275: Firefox did not print in landscape orientation.

MozillaFirefox, mozilla-nspr and mozilla-nss were updated to fix 17 security issues.

For more details please check the changelogs.

These security issues were fixed:

• CVE-2015-2724/CVE-2015-2725/CVE-2015-2726: Miscellaneous memory safety hazards (bsc#935979).
• CVE-2015-2728: Type confusion in Indexed Database Manager (bsc#935979).
• CVE-2015-2730: ECDSA signature validation fails to handle some signatures correctly (bsc#935979).
• CVE-2015-2722/CVE-2015-2733: Use-after-free in workers while using XMLHttpRequest (bsc#935979).
• CVE-2015-2734/CVE-2015-2735/CVE-2015-2736/CVE-2015-2737/CVE-2015-2738/CVE-2015-2739/CVE-2015-2740: Vulnerabilities found through code inspection (bsc#935979).
• CVE-2015-2743: Privilege escalation in PDF.js (bsc#935979).
• CVE-2015-4000: NSS accepts export-length DHE keys with regular DHE cipher suites (bsc#935033).
• CVE-2015-2721: NSS incorrectly permits skipping of ServerKeyExchange (bsc#935979).

This non-security issue was fixed:

• bsc#908275: Firefox did not print in landscape orientation.

MozillaFirefox, mozilla-nspr and mozilla-nss were updated to fix 17 security issues.

For more details please check the changelogs.

• CVE-2015-2724/CVE-2015-2725/CVE-2015-2726: Miscellaneous memory safety hazards (bsc#935979).
• CVE-2015-2728: Type confusion in Indexed Database Manager (bsc#935979).
• CVE-2015-2730: ECDSA signature validation fails to handle some signatures correctly (bsc#935979).
• CVE-2015-2722/CVE-2015-2733: Use-after-free in workers while using XMLHttpRequest (bsc#935979).
• CVE-2015-2734/CVE-2015-2735/CVE-2015-2736/CVE-2015-2737/CVE-2015-2738/CVE-2015-2739/CVE-2015-2740: Vulnerabilities found through code inspection (bsc#935979).
• CVE-2015-2743: Privilege escalation in PDF.js (bsc#935979).
• CVE-2015-4000: NSS accepts export-length DHE keys with regular DHE cipher suites (bsc#935033).
• CVE-2015-2721: NSS incorrectly permits skipping of ServerKeyExchange (bsc#935979).

Mozilla Firefox is being updated to the current Firefox 38ESR branch (specifically the 38.2.0ESR release).

Security issues fixed:

• MFSA 2015-78 / CVE-2015-4495: Same origin violation and local file stealing via PDF reader
• MFSA 2015-79 / CVE-2015-4473/CVE-2015-4474: Miscellaneous memory safety hazards (rv:40.0 / rv:38.2)
• MFSA 2015-80 / CVE-2015-4475: Out-of-bounds read with malformed MP3 file
• MFSA 2015-82 / CVE-2015-4478: Redefinition of non-configurable JavaScript object properties
• MFSA 2015-83 / CVE-2015-4479: Overflow issues in libstagefright
• MFSA 2015-87 / CVE-2015-4484: Crash when using shared memory in JavaScript
• MFSA 2015-88 / CVE-2015-4491: Heap overflow in gdk-pixbuf when scaling bitmap images
• MFSA 2015-89 / CVE-2015-4485/CVE-2015-4486: Buffer overflows on Libvpx when decoding WebM video
• MFSA 2015-90 / CVE-2015-4487/CVE-2015-4488/CVE-2015-4489: Vulnerabilities found through code inspection
• MFSA 2015-92 / CVE-2015-4492: Use-after-free in XMLHttpRequest with shared workers

The following vulnerabilities were fixed in ESR31 and are also included here:

• CVE-2015-2724/CVE-2015-2725/CVE-2015-2726: Miscellaneous memory safety hazards (bsc#935979).
• CVE-2015-2728: Type confusion in Indexed Database Manager (bsc#935979).
• CVE-2015-2730: ECDSA signature validation fails to handle some signatures correctly (bsc#935979).
• CVE-2015-2722/CVE-2015-2733: Use-after-free in workers while using XMLHttpRequest (bsc#935979).
• CVE-2015-2734/CVE-2015-2735/CVE-2015-2736/CVE-2015-2737/CVE-2015-2738/CVE-2015-2739/CVE-2015-2740: Vulnerabilities found through code inspection (bsc#935979).
• CVE-2015-2743: Privilege escalation in PDF.js (bsc#935979).
• CVE-2015-4000: NSS accepts export-length DHE keys with regular DHE cipher suites (bsc#935033).
• CVE-2015-2721: NSS incorrectly permits skipping of ServerKeyExchange (bsc#935979).

This update also contains a lot of feature improvements and bug fixes from 31ESR to 38ESR.

Also the Mozilla NSS library switched its CKBI API from 1.98 to 2.4, which is what Firefox 38ESR uses.

Mozilla Firefox and mozilla-nss were updated to fix 17 security issues.

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721)

Looben Yan discovered 2 use-after-free issues when using XMLHttpRequest in some circumstances. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. (CVE-2015-2722, CVE-2015-2733)

Bob Clary, Christian Holler, Bobby Holley, Andrew McCreight, Terrence Cole, Steve Fink, Mats Palmgren, Wes Kocher, Andreas Pehrson, Tooru Fujisawa, Andrew Sutherland, and Gary Kwong discovered multiple memory safety issues 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 via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. (CVE-2015-2724, CVE-2015-2725, CVE-2015-2726)

Armin Razmdjou discovered that opening hyperlinks with specific mouse and key combinations could allow a Chrome privileged URL to be opened without context restrictions being preserved. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass security restrictions. (CVE-2015-2727)

Paul Bandha discovered a type confusion bug in the Indexed DB Manager. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to cause a denial of service via application crash or execute arbitrary code with the priviliges of the user invoking Firefox. (CVE-2015-2728)

Holger Fuhrmannek discovered an out-of-bounds read in Web Audio. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to obtain sensitive information. (CVE-2015-2729)

Watson Ladd discovered that NSS incorrectly handled Elliptical Curve Cryptography (ECC) multiplication. A remote attacker could possibly use this issue to spoof ECDSA signatures. (CVE-2015-2730)

A use-after-free was discovered when a Content Policy modifies the DOM to remove a DOM object. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to cause a denial of service via application crash or execute arbitrary code with the priviliges of the user invoking Firefox. (CVE-2015-2731)

Ronald Crane discovered multiple security vulnerabilities. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. (CVE-2015-2734, CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740)

David Keeler discovered that key pinning checks can be skipped when an overridable certificate error occurs. This allows a user to manually override an error for a fake certificate, but cannot be exploited on its own. (CVE-2015-2741)

Jonas Jenwald discovered that some internal workers were incorrectly executed with a high privilege. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this in combination with another security vulnerability, to execute arbitrary code in a privileged scope. (CVE-2015-2743)

Matthew Green discovered a DHE key processing issue in NSS where a MITM could force a server to downgrade TLS connections to 512-bit export-grade cryptography. An attacker could potentially exploit this to impersonate the server. (CVE-2015-4000)

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721)

Watson Ladd discovered that NSS incorrectly handled Elliptical Curve Cryptography (ECC) multiplication. A remote attacker could possibly use this issue to spoof ECDSA signatures. (CVE-2015-2730)

As a security improvement, this update modifies NSS behaviour to reject DH key sizes below 768 bits, preventing a possible downgrade attack.

This update also refreshes the NSS package to version 3.19.2 which includes the latest CA certificate bundle.

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721)

Bob Clary, Christian Holler, Bobby Holley, and Andrew McCreight discovered multiple memory safety issues 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 via application crash, or execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2015-2724)

Ronald Crane discovered multiple security vulnerabilities. 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 via application crash, or execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2015-2734, CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740)

Matthew Green discovered a DHE key processing issue in NSS where a MITM could force a server to downgrade TLS connections to 512-bit export-grade cryptography. An attacker could potentially exploit this to impersonate the server. (CVE-2015-4000)