CVE-2020-12399

NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications.

Netscape Portable Runtime (NSPR) provides platform independence for non-GUI operating system facilities.

The following packages have been upgraded to a later upstream version: nss (3.53.1), nspr (4.25.0). (BZ#1809549, BZ#1809550)

Security Fix(es):

• nss: UAF in sftk_FreeSession due to improper refcounting (CVE-2019-11756)

• nss: Check length of inputs for cryptographic primitives (CVE-2019-17006)

• nss: Side channel vulnerabilities during RSA key generation (CVE-2020-12402)

• nss: TLS 1.3 HelloRetryRequest downgrade request sets client into invalid state (CVE-2019-17023)

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.

Bug Fix(es):

• Install of update of nss.x86_64 adds i686 into transaction (BZ#1663187)

• NSS does not set downgrade sentinel in ServerHello.random for TLS 1.0 and TLS 1.1 (BZ#1691409)

• TLS Keying Material Exporter is unsupported by command line tools (BZ#1691454)

• TLS_AES_256_GCM_SHA384 is not marked as FIPS compatible (BZ#1711375)

• Make TLS 1.3 work in FIPS mode (BZ#1724250)

• NSS rejects records with large padding with SHA384 HMAC (BZ#1750921)

• NSS missing IKEv1 Quick Mode KDF (BZ#1809637)

• Name Constraints validation: CN treated as DNS name even when syntactically invalid as DNS name (BZ#1825270)

• FIPS needs nss to restrict valid dh primes to those primes that are approved. (BZ#1854564)

• nss needs to comply to the new SP800-56A rev 3 requirements (BZ#1855825)

Enhancement(s):

• [RFE] nss should use AES for storage of keys (BZ#1723819)

NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

This update for mozilla-nspr, mozilla-nss fixes the following issues:

mozilla-nss was updated to version 3.53

• CVE-2020-12399: Fixed a timing attack on DSA signature generation (bsc#1171978).
• CVE-2019-17006: Added length checks for cryptographic primitives (bsc#1159819). Release notes: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.53_release_notes

mozilla-nspr to version 4.25

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 libfreebl3-3.69.1-1.2 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 mozilla-nspr, mozilla-nss fixes the following issues:

mozilla-nss was updated to version 3.53.1

• CVE-2019-11745: Out-of-bounds write when passing an output buffer smaller than the block size to NSC_EncryptUpdate
• CVE-2020-12402: Fixed a potential side channel attack during RSA key generation (bsc#1173032).
• CVE-2020-12399: Fixed a timing attack on DSA signature generation (bsc#1171978).
• CVE-2019-17006: Added length checks for cryptographic primitives (bsc#1159819).
• CVE-2019-11727: A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages.
• Fixed various FIPS issues in libfreebl3 which were causing segfaults in the test suite of chrony (bsc#1168669).
• Fixed an issue where Firefox tab was crashing (bsc#1170908).

Release notes: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.53_release_notes

mozilla-nspr was updated to version 4.25.

This update for mozilla-nspr, mozilla-nss fixes the following issues:

mozilla-nss was updated to version 3.53

• CVE-2020-12399: Fixed a timing attack on DSA signature generation (bsc#1171978).
• CVE-2019-17006: Added length checks for cryptographic primitives (bsc#1159819). Release notes: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.53_release_notes

mozilla-nspr to version 4.25

This update for mozilla-nspr, mozilla-nss fixes the following issues:

mozilla-nss was updated to version 3.53.1

• CVE-2020-12402: Fixed a potential side channel attack during RSA key generation (bsc#1173032).
• CVE-2020-12399: Fixed a timing attack on DSA signature generation (bsc#1171978).
• CVE-2019-17006: Added length checks for cryptographic primitives (bsc#1159819).
• Fixed various FIPS issues in libfreebl3 which were causing segfaults in the test suite of chrony (bsc#1168669).
• Fixed an issue where Firefox tab was crashing (bsc#1170908).

Release notes: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.53_release_notes

mozilla-nspr to version 4.25

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, spoof the addressbar, or execute arbitrary code. (CVE-2020-12405, CVE-2020-12406, CVE-2020-12407, CVE-2020-12408, CVE-2020-12409, CVE-2020-12410, CVE-2020-12411)

It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could potentially exploit this to obtain private keys using a timing attack. (CVE-2020-12399)

It was discovered that NSS incorrectly handled the TLS State Machine. A remote attacker could possibly use this issue to cause NSS to hang, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.10. (CVE-2019-17023)

Cesar Pereida Garcia discovered that NSS incorrectly handled DSA key generation. A local attacker could possibly use this issue to perform a timing attack and recover DSA keys. (CVE-2020-12399)

USN-4397-1 fixed a vulnerability in NSS. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

Cesar Pereida Garcia discovered that NSS incorrectly handled DSA key generation. A local attacker could possibly use this issue to perform a timing attack and recover DSA keys. (CVE-2020-12399)

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, or execute arbtirary code. (CVE-2020-12405, CVE-2020-12406, CVE-2020-12410, CVE-2020-12417, CVE-2020-12418, CVE-2020-12419, CVE-2020-12420)

It was discovered that Thunderbird would continue an unencrypted connection when configured to use STARTTLS for IMAP if the server responded with PREAUTH. A remote attacker could potentially exploit this to perform a person-in-the-middle attack in order to obtain sensitive information. (CVE-2020-12398)

It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could potentially exploit this to obtain private keys using a timing attack. (CVE-2020-12399)

It was discovered that when performing add-on updates, certificate chains not terminating with built-in roots were silently rejected. This could result in add-ons becoming outdated. (CVE-2020-12421)