An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). NOTE: this issue was introduced when attempting to fix CVE-2023-27560.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7404-1 advisory.

    It was discovered that phpseclib did not correctly handle RSA PKCS#1 v1.5 signature verification. An     attacker could possibly use this issue to bypass authentication. This issue only affected Ubuntu 20.04     LTS. (CVE-2021-30130)

    It was discovered that phpseclib did not correctly handle certain characters in certain TLS fields, which     could lead to name confusion. An attacker could possibly use this issue to bypass authentication.
    (CVE-2023-52892)

    It was discovered that phpseclib incorrectly limited the size of prime numbers generated by isPrime. An     attacker could possibly use this issue to cause a denial of service. (CVE-2024-27354)

    It was discovered that phpseclib did not correctly handle processing the ASN.1 object identifier of a     certificate. An attacker could possibly use this issue to cause a denial of service. This issue only     affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-27355)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-b38cbff99d advisory.

    Security fix for CVE-2023-52892, CVE-2024-27354

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-91d6e174d9 advisory.

    Security fix for CVE-2023-52892, CVE-2024-27354

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-3750 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3750-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     March 05, 2024                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : php-phpseclib     Version        : 2.0.30-2~deb10u3     CVE ID         : CVE-2024-27354 CVE-2024-27355

    Security issues were discovered in php-phpseclib, a PHP library for     arbitrary-precision integer arithmetic, which could lead to Denial of     Service.

    CVE-2024-27354

        An attacker can construct a malformed certificate containing an         extremely large prime to cause a denial of service (CPU consumption         for an `isPrime` primality check).

        This issue was introduced when attempting to fix CVE-2023-27560.

    CVE-2024-27355

        When processing the ASN.1 object identifier of a certificate, a sub         identifier may be provided that leads to a denial of service (CPU         consumption for `decodeOID`).

    For Debian 10 buster, these problems have been fixed in version     2.0.30-2~deb10u3.

    We recommend that you upgrade your php-phpseclib packages.

    For the detailed security status of php-phpseclib please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/php-phpseclib

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-3749 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3749-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     March 05, 2024                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : phpseclib     Version        : 1.0.19-3~deb10u3     CVE ID         : CVE-2024-27354 CVE-2024-27355

    Security issues were discovered in phpseclib, a PHP library for     arbitrary-precision integer arithmetic, which could lead to Denial of     Service.

    CVE-2024-27354

        An attacker can construct a malformed certificate containing an         extremely large prime to cause a denial of service (CPU consumption         for an `isPrime` primality check).

        This issue was introduced when attempting to fix CVE-2023-27560.

    CVE-2024-27355

        When processing the ASN.1 object identifier of a certificate, a sub         identifier may be provided that leads to a denial of service (CPU         consumption for `decodeOID`).

    For Debian 10 buster, these problems have been fixed in version     1.0.19-3~deb10u3.

    We recommend that you upgrade your phpseclib packages.

    For the detailed security status of phpseclib please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/phpseclib

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
233753	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS : phpseclib vulnerabilities (USN-7404-1)	Nessus	Ubuntu Local Security Checks	high
215157	Fedora 40 : php-phpseclib (2025-b38cbff99d)	Nessus	Fedora Local Security Checks	high
215152	Fedora 41 : php-phpseclib (2025-91d6e174d9)	Nessus	Fedora Local Security Checks	high
191553	Debian dla-3750 : php-phpseclib - security update	Nessus	Debian Local Security Checks	high
191552	Debian dla-3749 : php-seclib - security update	Nessus	Debian Local Security Checks	high

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