4.7

CVE-2019-1547: ECDSA remote timing attack

Modified
AliasesALPINE-CVE-2019-1547UBUNTU-CVE-2019-1547DEBIAN-CVE-2019-1547
Published 10-09-2019Last modified 16-09-2024

Vulnerability summary

CVE-2019-1547 is a medium (CVSS 4.7) vulnerability in openssl. EPSS estimates a 1.17% chance of exploitation in the next 30 days, higher than 67.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.7/10
010
Medium · v3.1 (NVD)
EPSS score
1.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 19
DLA-1932-1DSA-4539-1DSA-4540-1MGASA-2019-0354OPENSUSE-SU-2019:2158-1OPENSUSE-SU-2019:2189-1

Timeline

  1. 10-09-2019
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.17%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine3 products
  • openssl≥ 1.0.2, < 1.1.1d-r0 | ≥ 1.0.2, < 1.1.1d-r1 | ≥ 1.0.2, < 1.0.2t-r0
  • openssl1.1-compat< 1.1.1d-r1
  • openssl3< 1.1.1d-r1
Ubuntu2 products
  • openssl< 1.0.1f-1ubuntu2.27+esm1 | < 1.0.2g-1ubuntu4.16 | < 1.1.1-1ubuntu2.1~18.04.6
  • openssl1.0< 1.0.2n-1ubuntu5.4
Debian1 product
  • openssl< 1.1.1d-1
Openssl1 product
  • opensslFixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c) | Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k) | Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s) | ≥ 1.0.2, ≤ 1.0.2s | ≥ 1.1.0, ≤ 1.1.0k | ≥ 1.1.1, ≤ 1.1.1c

4 vendors · 7 products

References

42 links
Show all 42 references