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    CVE-2021-3761

    Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.

    Published:Sep 9, 2021
    Last Modified:Nov 21, 2024
    EPS:Sep 9, 2021
    EPSS Score:0.0045
    CVSS Score:7.5

    Affected Products

    Vendor
    Cloudflare
    Product
    Octorpki
    Vendor
    Debian
    Product
    Debian Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2021-3978 (CVSS 7.5) — When copying files with rsync, octorpki uses the "-a" flag 0, which forces rsync to copy binaries with the sui…
    CVE-2022-3616 (CVSS 5.4) — Attackers can create long chains of CAs that would lead to OctoRPKI exceeding its max iterations parameter. In…
    CVE-2021-3912 (CVSS 4.2) — OctoRPKI tries to load the entire contents of a repository in memory, and in the case of a GZIP bomb, unzip it…
    CVE-2021-3911 (CVSS 4.2) — If the ROA that a repository returns contains too many bits for the IP address then OctoRPKI will crash.…
    CVE-2021-3910 (CVSS 4.4) — OctoRPKI crashes when encountering a repository that returns an invalid ROA (just an encoded NUL (\0) characte…
    CVE-2021-3909 (CVSS 4.4) — OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place which ma…
    CVE-2021-3908 (CVSS 5.9) — OctoRPKI does not limit the depth of a certificate chain, allowing for a CA to create children in an ad-hoc fa…
    CVE-2021-3907 (CVSS 7.4) — OctoRPKI does not escape a URI with a filename containing "..", this allows a repository to create a file, (ex…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High