Bug 1826177 (CVE-2020-12399)
| Summary: | CVE-2020-12399 nss: Timing attack on DSA signature generation | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Marian Rehak <mrehak> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | bmontgom, crypto-team, cschalle, dueno, elio.maldonado.batiz, eparis, gecko-bugs-nobody, jburrell, jhorak, jokerman, kdudka, kengert, markdenihan, nss-nspr-maint, nstielau, rrelyea, security-response-team, sponnaga, stransky |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | nss 3.44.4, nss 3.52.1, thunderbird 68.9.0 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A flaw was found in the DSA signature generation function in nss. During the process of generating a DSA signature, the nonce value 'k' is not padded, exposing the bit length. Combined with other techniques, this can result in the recovery of the DSA private key. The highest threat from this vulnerability is to data confidentiality.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-01-18 22:44:56 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1838376, 1838377, 1838378 | ||
| Bug Blocks: | 1826178 | ||
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Description
Marian Rehak
2020-04-21 07:47:53 UTC
OpenShift 4.x only packages nss-altfiles and has been confirmed to *not* share any of the vulnerable signature code:
- nss-altfiles only reads information from files in the same format as /etc/passwd and /etc/group.
Upstream patch: https://hg.mozilla.org/projects/nss/rev/daa823a4a29bcef0fec33a379ec83857429aea2e Upstream bug (still private): https://bugzilla.mozilla.org/show_bug.cgi?id=1631576 Acknowledgments: Name: the Mozilla Project Upstream: Cesar Pereida Garcia and the Network and Information Security Group (NISEC) (Tampere University) External References: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.44.4_release_notes https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.52.1_release_notes Created nss tracking bugs for this issue: Affects: fedora-all [bug 1838376] Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. @Huzaifa Can you clarify the mitigation statement? Is the mitigation not available or is it available and doesn't meet the Red Hat Product Security criteria. Is there any indication of when a mitigation would be available? Statement: A timing attack was found in the way NSS generated DSA signatures. A man-in-the-middle attacker could use this attack during DSA signature generation to recover the private key. This attack is only feasible when the attacker is local to the machine or in certain cross-VM scenarios where the signature is being generated. Attacks over the network or via the internet are not feasible. Firefox and Thunderbird on Red Hat Enterprise Linux are built against the system nss library. |