DescriptionA Bleichenbacher type side-channel based padding oracle attack was found in the way nettle handles endian conversion of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run a process on the same physical core as the victim process, could use this flaw extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
nettle (PTS)bullseye3.7.3-1fixed
trixie, sid3.10-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[stretch] - nettle <no-dsa> (Minor issue)
[jessie] - nettle <no-dsa> (Minor issue -
The upstream correction also makes a new public function that packages using
nettle should use. This means that fixing this CVE is a pre-requisite for
fixing other CVEs like CVE-2018-16868.

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