{
  "threat_severity" : "Moderate",
  "public_date" : "2020-05-27T00:00:00Z",
  "bugzilla" : {
    "description" : "python-rsa: decryption of ciphertext leads to DoS",
    "id" : "1848507",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1848507"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-325",
  "details" : [ "Python-RSA before 4.1 ignores leading '\\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).", "A flaw was found in the python-rsa package, where it does not explicitly check the ciphertext length against the key size and ignores the leading 0 bytes during the decryption of the ciphertext. This flaw allows an attacker to perform a ciphertext attack, leading to a denial of service. The highest threat from this vulnerability is to confidentiality." ],
  "statement" : "In Red Hat OpenStack Platform, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP python-rsa package.",
  "affected_release" : [ {
    "product_name" : "Red Hat OpenShift Container Platform 3.11",
    "release_date" : "2020-08-27T00:00:00Z",
    "advisory" : "RHSA-2020:3541",
    "cpe" : "cpe:/a:redhat:openshift:3.11::el7",
    "package" : "python-rsa-0:4.5-2.el7"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.5",
    "release_date" : "2020-08-18T00:00:00Z",
    "advisory" : "RHSA-2020:3453",
    "cpe" : "cpe:/a:redhat:openshift:4.5::el7",
    "package" : "python-rsa-0:4.5-1.el7"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Ceph Storage 4",
    "fix_state" : "Affected",
    "package_name" : "python-rsa",
    "cpe" : "cpe:/a:redhat:ceph_storage:4"
  }, {
    "product_name" : "Red Hat OpenStack Platform 13 (Queens)",
    "fix_state" : "Will not fix",
    "package_name" : "python-rsa",
    "cpe" : "cpe:/a:redhat:openstack:13"
  }, {
    "product_name" : "Red Hat OpenStack Platform 15 (Stein)",
    "fix_state" : "Will not fix",
    "package_name" : "python-rsa",
    "cpe" : "cpe:/a:redhat:openstack:15"
  }, {
    "product_name" : "Red Hat OpenStack Platform 16 (Train)",
    "fix_state" : "Will not fix",
    "package_name" : "python-rsa",
    "cpe" : "cpe:/a:redhat:openstack:16"
  }, {
    "product_name" : "Red Hat Quay 3",
    "fix_state" : "Affected",
    "package_name" : "python-rsa",
    "cpe" : "cpe:/a:redhat:quay:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2020-13757\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-13757\nhttps://github.com/sybrenstuvel/python-rsa/issues/146" ],
  "name" : "CVE-2020-13757",
  "csaw" : false
}