CVE-2025-27587 Information disclosure in n/a
A timing side-channel in OpenSSL on PowerPC allows local attackers to extract private keys via statistical analysis of signing times.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-27587?
CVE-2025-27587 is a medium-severity vulnerability in n/a, published on 16 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenSSL 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.
Weakness: CWE-385
Which versions are affected by CVE-2025-27587?
Linux distribution packages (4)
openssl-3 SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 3.1.4-150600.5.27.1 |
openssl-3 SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 3.2.3-150700.5.10.1 |
openssl-3 SUSE:Linux Micro 6.1 | All versions | 3.1.4-slfo.1.1_5.1 |
openssl-3 openSUSE:Leap 15.6 | All versions | 3.1.4-150600.5.27.1 |
How do I fix CVE-2025-27587?
Apply the vendor's patch.
Is CVE-2025-27587 being exploited?
There is no known exploitation of CVE-2025-27587 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-27587, GHSA-jqr3-3jm7-r6cm, SUSE-SU-2025:02236-1, SUSE-SU-2025:1550-1, SUSE-SU-2025:20417-1.