rsaz_512_sqr overflow bug on x86_64
Vulnerability Description
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- OSS-Fuzz and Guido Vranken
References
- https://seclists.org/bugtraq/2019/Dec/39
- https://www.debian.org/security/2019/dsa-4594
- https://seclists.org/bugtraq/2019/Dec/46
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.html
- https://security.gentoo.org/glsa/202004-10
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/
- https://usn.ubuntu.com/4376-1/
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.tenable.com/security/tns-2019-09
- https://www.openssl.org/news/secadv/20191206.txt
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=419102400a2811582a7a3d4a4e317d72e5ce0a8f
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f1c5eea8a817075d31e43f5876993c6710238c98
- https://security.netapp.com/advisory/ntap-20191210-0001/
- http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.html
- https://www.tenable.com/security/tns-2020-03
- https://usn.ubuntu.com/4504-1/
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.tenable.com/security/tns-2020-11
- https://www.debian.org/security/2021/dsa-4855
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.tenable.com/security/tns-2021-10
- https://lists.debian.org/debian-lts-announce/2022/03/msg00023.html
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Weaknesses (CWE)
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MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.