CVE-2025-27587

NameCVE-2025-27587
DescriptionOpenSSL 3.0.0 through 3.3.2 on the PowerPC architecture is vulnerable to a Minerva attack, exploitable by measuring the time of signing of random messages using the EVP_DigestSign API, and then using the private key to extract the K value (nonce) from the signatures. Next, based on the bit size of the extracted nonce, one can compare the signing time of full-sized nonces to signatures that used smaller nonces, via statistical tests. There is a side-channel in the P-364 curve that allows private key extraction (also, there is a dependency between the bit size of K and the size of the side channel). NOTE: This CVE is disputed because the OpenSSL security policy explicitly notes that any side channels which require same physical system to be detected are outside of the threat model for the software. The timing signal is so small that it is infeasible to be detected without having the attacking process running on the same physical system.
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
openssl (PTS)bullseye1.1.1w-0+deb11u1vulnerable
bullseye (security)1.1.1w-0+deb11u3vulnerable
bookworm3.0.16-1~deb12u1vulnerable
bookworm (security)3.0.14-1~deb12u2vulnerable
sid, trixie3.5.0-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsource(unstable)3.5.0-1unimportant

Notes

https://github.com/openssl/openssl/issues/24253
https://github.com/openssl/openssl/commit/85cabd94958303859b1551364a609d4ff40b67a5 (master)
https://github.com/openssl/openssl/commit/080c6be0b102934bf66daeac70f0863f209f8d0f (openssl-3.5.0-beta1)
https://github.com/openssl/openssl/issues/24253#issuecomment-2144391562
Not considered a vulnerability by OpenSSL upstream

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