Mageia 2020-0308: botan2 security update

    Date 31 Jul 2020
    185
    Posted By LinuxSecurity Advisories
    The CBC padding operations were not constant time and as a result would leak the length of the plaintext values which were being padded to an attacker running a side channel attack via shared resources such as cache or branch predictor. No information about the contents was leaked, but the length alone might be used to make inferences about the contents. This issue affects TLS CBC
    MGASA-2020-0308 - Updated botan2 packages fix security vulnerability
    
    Publication date: 31 Jul 2020
    URL: https://advisories.mageia.org/MGASA-2020-0308.html
    Type: security
    Affected Mageia releases: 7
    
    The CBC padding operations were not constant time and as a result would leak
    the length of the plaintext values which were being padded to an attacker
    running a side channel attack via shared resources such as cache or branch
    predictor. No information about the contents was leaked, but the length alone
    might be used to make inferences about the contents. This issue affects TLS CBC
    ciphersuites as well as CBC encryption using PKCS7 or other similar padding
    mechanisms. In all cases, the unpadding operations were already constant time
    and are not affected (rhbz#1849743).
    
    References:
    - https://bugs.mageia.org/show_bug.cgi?id=26955
    - https://bugzilla.redhat.com/show_bug.cgi?id=1849743
    - https://lists.fedoraproject.org/archives/list/This email address is being protected from spambots. You need JavaScript enabled to view it./thread/Q5LBXWVOCUQCEGOOMVMLI4WVTQ5DT4RG/
    
    SRPMS:
    - 7/core/botan2-2.9.0-2.1.mga7
    

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