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    2 vulnerabilities by tlslite-ng_project

    CVE-2020-26263 (GCVE-0-2020-26263)

    Vulnerability from cvelistv5 – Published: 2020-12-21 16:55 – Updated: 2024-08-04 15:56
    VLAI
    Title
    RSA vulnerability in tslite-ng
    Summary
    tlslite-ng is an open source python library that implements SSL and TLS cryptographic protocols. In tlslite-ng before versions 0.7.6 and 0.8.0-alpha39, the code that performs decryption and padding check in RSA PKCS#1 v1.5 decryption is data dependant. In particular, the code has multiple ways in which it leaks information about the decrypted ciphertext. It aborts as soon as the plaintext doesn't start with 0x00, 0x02. All TLS servers that enable RSA key exchange as well as applications that use the RSA decryption API directly are vulnerable. This is patched in versions 0.7.6 and 0.8.0-alpha39. Note: the patches depend on Python processing the individual bytes in side-channel free manner, this is known to not the case (see reference). As such, users that require side-channel resistance are recommended to use different TLS implementations, as stated in the security policy of tlslite-ng.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    CWE
    • CWE-326 - Inadequate Encryption Strength
    Assigner
    References
    Impacted products
    Vendor Product Version
    tlsfuzzer tlslite-ng Affected: < 0.7.6
    Affected: >= 0.8.0-alpha1, < 0.8.0-alpha39
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2018-1000159 (GCVE-0-2018-1000159)

    Vulnerability from cvelistv5 – Published: 2018-04-18 19:00 – Updated: 2024-08-05 12:33
    VLAI
    Summary
    tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line "end_pos = data_len - 1 - mac.digest_size" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Date Public
    2018-04-18 00:00
    Show details on NVD website
    To clipboard 

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