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    Mageia 2020-0023: openssl security update

    Date
    542
    Posted By
    Updated compat-openssl10 and openssl packages fix security vulnerability: 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,
    MGASA-2020-0023 - Updated openssl packages fix security vulnerability
    
    Publication date: 05 Jan 2020
    URL: https://advisories.mageia.org/MGASA-2020-0023.html
    Type: security
    Affected Mageia releases: 7
    CVE: CVE-2019-1551
    
    Updated compat-openssl10 and openssl packages fix security vulnerability:
    
    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 (CVE-2019-1551).
    
    References:
    - https://bugs.mageia.org/show_bug.cgi?id=25977
    - https://www.openssl.org/news/secadv/20191206.txt
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-1551
    
    SRPMS:
    - 7/core/openssl-1.1.0l-1.1.mga7
    - 7/core/compat-openssl10-1.0.2u-1.mga7
    

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