{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"moderate"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2024-1544","title":"Title"},{"category":"description","text":"Generating the ECDSA nonce k samples a random number r and then \ntruncates this randomness with a modular reduction mod n where n is the \norder of the elliptic curve. Meaning k = r mod n. The division used \nduring the reduction estimates a factor q_e by dividing the upper two \ndigits (a digit having e.g. a size of 8 byte) of r by the upper digit of \nn and then decrements q_e in a loop until it has the correct size. \nObserving the number of times q_e is decremented through a control-flow \nrevealing side-channel reveals a bias in the most significant bits of \nk. Depending on the curve this is either a negligible bias or a \nsignificant bias large enough to reconstruct k with lattice reduction \nmethods. For SECP160R1, e.g., we find a bias of 15 bits.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2024-1544","url":"https://www.suse.com/security/cve/CVE-2024-1544"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1229876 for CVE-2024-1544","url":"https://bugzilla.suse.com/1229876"}],"title":"SUSE CVE CVE-2024-1544","tracking":{"current_release_date":"2025-12-19T01:13:11Z","generator":{"date":"2024-08-29T03:22:11Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2024-1544","initial_release_date":"2024-08-29T03:22:11Z","revision_history":[{"date":"2024-08-29T03:22:11Z","number":"2","summary":"Current version"},{"date":"2025-01-01T01:44:01Z","number":"3","summary":"Current version"},{"date":"2025-02-14T05:51:23Z","number":"4","summary":"Current version"},{"date":"2025-02-16T05:43:18Z","number":"5","summary":"Current version"},{"date":"2025-10-13T23:27:07Z","number":"6","summary":"Current version"},{"date":"2025-12-17T01:04:44Z","number":"7","summary":"description changed"},{"date":"2025-12-19T01:13:11Z","number":"8","summary":"description changed"}],"status":"interim","version":"8"}}}