The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.

The remote host is affected by the vulnerability described in GLSA-202405-08 (strongSwan: Multiple Vulnerabilities)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

  - strongSwan before 5.9.8 allows remote attackers to cause a denial of service in the revocation plugin by     sending a crafted end-entity (and intermediate CA) certificate that contains a CRL/OCSP URL that points to     a server (under the attacker's control) that doesn't properly respond but (for example) just does nothing     after the initial TCP handshake, or sends an excessive amount of application data. (CVE-2022-40617)

  - strongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a variable named     public for two different purposes within the same function. There is initially incorrect access control,     later followed by an expired pointer dereference. One attack vector is sending an untrusted client     certificate during EAP-TLS. A server is affected only if it loads plugins that implement TLS-based EAP     methods (EAP-TLS, EAP-TTLS, EAP-PEAP, or EAP-TNC). This is fixed in 5.9.10. (CVE-2023-26463)

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

According to the versions of the strongimcv package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 58528a94-5100-4208-a04d-edc01598cf01 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1399-1 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2788 advisory.

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote SUSE Linux SLES11 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2021:14827-1 advisory.

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3467-1 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3469-1 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2021:3468-1 advisory.

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:3467-1 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote Ubuntu 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-5111-2 advisory.

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote Debian 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4989 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

The remote Ubuntu 18.04 LTS / 20.04 LTS / 21.04 / 21.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5111-1 advisory.

  - The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an     RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent     by an initiator. Remote code execution cannot occur. (CVE-2021-41990)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

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

ID	Name	Product	Family	Severity
194978	GLSA-202405-08 : strongSwan: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
161598	EulerOS 2.0 SP3 : strongimcv (EulerOS-SA-2022-1767)	Nessus	Huawei Local Security Checks	high
500650	Siemens SIMATIC NET CP, SINEMA & SCALANCE Integer Overflow (CVE-2021-41991)	Tenable OT Security	Tenable.ot	high
159097	EulerOS 2.0 SP5 : strongimcv (EulerOS-SA-2022-1338)	Nessus	Huawei Local Security Checks	high
157239	FreeBSD : strongswan - denial-of-service vulnerability in the gmp plugin/denial-of-service vulnerability in the in-memory certificate cache (58528a94-5100-4208-a04d-edc01598cf01)	Nessus	FreeBSD Local Security Checks	high
154770	openSUSE 15 Security Update : strongswan (openSUSE-SU-2021:1399-1)	Nessus	SuSE Local Security Checks	high
154257	Debian DLA-2788-1 : strongswan - LTS security update	Nessus	Debian Local Security Checks	high
154250	SUSE SLES11 Security Update : strongswan (SUSE-SU-2021:14827-1)	Nessus	SuSE Local Security Checks	high
154249	SUSE SLED15 / SLES15 Security Update : strongswan (SUSE-SU-2021:3467-1)	Nessus	SuSE Local Security Checks	high
154248	SUSE SLES15 Security Update : strongswan (SUSE-SU-2021:3469-1)	Nessus	SuSE Local Security Checks	high
154247	SUSE SLES12 Security Update : strongswan (SUSE-SU-2021:3468-1)	Nessus	SuSE Local Security Checks	high
154243	openSUSE 15 Security Update : strongswan (openSUSE-SU-2021:3467-1)	Nessus	SuSE Local Security Checks	high
154242	Ubuntu 16.04 ESM : strongSwan vulnerability (USN-5111-2)	Nessus	Ubuntu Local Security Checks	high
154229	Debian DSA-4989-1 : strongswan - security update	Nessus	Debian Local Security Checks	high
154227	Ubuntu 18.04 LTS / 20.04 LTS : strongSwan vulnerabilities (USN-5111-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2021-41991

high

Tenable Plugins

critical

high

high

high

high

high

high

high

high

high

high

high

high

high

high