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CVE-2021-20305

Priority
Medium

Description
A flaw was found in Nettle in versions before 3.7.2, where several Nettle
signature verification functions (GOST DSA, EDDSA & ECDSA) result in the
Elliptic Curve Cryptography point (ECC) multiply function being called with
out-of-range scalers, possibly resulting in incorrect results. This flaw
allows an attacker to force an invalid signature, causing an assertion
failure or possible validation. The highest threat to this vulnerability is
to confidentiality, integrity, as well as system availability.

References
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20305
https://lists.lysator.liu.se/pipermail/nettle-bugs/2021/009457.html
https://ubuntu.com/security/notices/USN-4906-1

Bugs
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985652

Assigned-to
mdeslaur

Notes



Package
Source: nettle (LP Ubuntu Debian)

Upstream:released (3.7.2-1) Ubuntu 18.04 LTS:released (3.4-1ubuntu0.1) Ubuntu
20.04 LTS:released (3.5.1+really3.5.1-2ubuntu0.1) Ubuntu 21.10:released
(3.7-2.1ubuntu1) Ubuntu 16.04 ESM:released (3.2-1ubuntu0.16.04.2) Ubuntu 22.04
LTS:released (3.7-2.1ubuntu1) Ubuntu 14.04 ESM:needs-triage

Patches:

Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/a63893791280d441c713293491da97c79c0950fe
Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/971bed6ab4b27014eb23085e8176917e1a096fd5
Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/74ee0e82b6891e090f20723750faeb19064e31b2
Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/51f643eee00e2caa65c8a2f5857f49acdf3ef1ce
Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/401c8d53d8a8cf1e79980e62bda3f946f8e07c14
Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/ae3801a0e5cce276c270973214385c86048d5f7b
Upstream:https://git.lysator.liu.se/nettle/nettle/-/commit/63f222c60b03470c0005aa9bc4296fbf585f68b9

More Information
 * Mitre
 * NVD
 * Launchpad
 * Debian

Updated: 2022-04-25 00:51:45 UTC (commit
ecc1009cb19540b950de59270950018900f37f15)

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