Detections
Analytics

Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : strongSwan vulnerabilities (USN-8789-1)

high Nessus Plugin ID 350301

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8789-1 advisory.

 It was discovered that strongSwan incorrectly handled PKCS#7 containers in the openssl plugin. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service.
 (CVE-2026-78123)

 It was discovered that strongSwan incorrectly handled memory when enumerating certificates in PKCS#7 containers in the openssl plugin. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-78124)

 It was discovered that strongSwan incorrectly handled AKA-Synchronization-Failure messages in the eap-aka plugin. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-78126)

 It was discovered that strongSwan incorrectly handled memory when stringifying IKE messages. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-78127)

 It was discovered that strongSwan incorrectly handled PKCS#5 decryption. A remote attacker could possibly use this issue to cause strongSwan to consume excessive resources, leading to a denial of service.
 (CVE-2026-78129)

 It was discovered that strongSwan incorrectly handled attribute certificates in the x509 plugin when the issuer name was missing. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-78130)

 It was discovered that strongSwan incorrectly handled memory when parsing attribute certificates in the x509 plugin. A remote attacker could possibly use this issue to obtain sensitive information.
 (CVE-2026-78131)

 It was discovered that strongSwan incorrectly handled attribute certificates containing ietfAttrSyntax values in the x509 plugin. A remote attacker could possibly use this issue to cause strongSwan to consume excessive resources, leading to a denial of service. (CVE-2026-78132)

 It was discovered that strongSwan incorrectly handled IKEv2 rekeying collisions with multi-key exchange. A remote attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-78133)

 It was discovered that strongSwan incorrectly validated inner EAP method authentication details in the eap-ttls and eap-peap plugins. An authenticated user could possibly use this issue to bypass authentication. (CVE-2026-78134)

 It was discovered that strongSwan incorrectly handled CREATE_CHILD_SA requests on unestablished IKE_SAs. A remote attacker could possibly use this issue to bypass authentication. (CVE-2026-78135)

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.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8789-1

Plugin Details

Severity: High

ID: 350301

File Name: ubuntu_USN-8789-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/25/2026

Updated: 9/25/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-78135

CVSS v3

Risk Factor: High

Base Score: 7.3

Temporal Score: 6.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:charon-cmd, p-cpe:/a:canonical:ubuntu_linux:charon-systemd, p-cpe:/a:canonical:ubuntu_linux:libcharon-extauth-plugins, p-cpe:/a:canonical:ubuntu_linux:libcharon-extra-plugins, p-cpe:/a:canonical:ubuntu_linux:libstrongswan-extra-plugins, p-cpe:/a:canonical:ubuntu_linux:libstrongswan-standard-plugins, p-cpe:/a:canonical:ubuntu_linux:libstrongswan, p-cpe:/a:canonical:ubuntu_linux:strongswan-charon, p-cpe:/a:canonical:ubuntu_linux:strongswan-libcharon, p-cpe:/a:canonical:ubuntu_linux:strongswan-nm, p-cpe:/a:canonical:ubuntu_linux:strongswan-pki, p-cpe:/a:canonical:ubuntu_linux:strongswan-scepclient, p-cpe:/a:canonical:ubuntu_linux:strongswan-starter, p-cpe:/a:canonical:ubuntu_linux:strongswan-swanctl, p-cpe:/a:canonical:ubuntu_linux:strongswan

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 9/21/2026

Vulnerability Publication Date: 9/10/2026

Reference Information

CVE: CVE-2026-78123, CVE-2026-78124, CVE-2026-78126, CVE-2026-78127, CVE-2026-78129, CVE-2026-78130, CVE-2026-78131, CVE-2026-78132, CVE-2026-78133, CVE-2026-78134, CVE-2026-78135

USN: 8789-1