CVE-2003-0147

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2003-03-31 · updated 2026-06-16

Description

OpenSSL does not use RSA blinding by default, which allows local and remote attackers to obtain the server's private key by determining factors using timing differences on (1) the number of extra reductions during Montgomery reduction, and (2) the use of different integer multiplication algorithms ("Karatsuba" and normal).

Affected products

Openpkg: 1.1, 1.2
OpenSSL: 0.9.6, 0.9.6a, 0.9.6b, 0.9.6c, 0.9.6d, 0.9.6e (+5)
stunnel: 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 (+15)

References

http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0130.html
http://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000625
http://marc.info/?l=bugtraq&m=104766550528628&w=2
http://marc.info/?l=bugtraq&m=104792570615648&w=2
http://marc.info/?l=bugtraq&m=104819602408063&w=2
http://marc.info/?l=bugtraq&m=104829040921835&w=2
http://marc.info/?l=bugtraq&m=104861762028637&w=2
http://www.debian.org/security/2003/dsa-288
http://www.gentoo.org/security/en/glsa/glsa-200303-23.xml

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