Libreswan

Signature forgery and denial-of-service in Libreswan's IKEv1 RSA authentication allows a remote unauthenticated attacker to impersonate an IKE peer or crash the daemon. The flaw lives in RSA_authenticate_hash_signature_raw_rsa(), which fails to validate the length of the authentication hash inside a PKCS #1 (RFC 2313) encoded SIG payload; when a peer uses a small RSA public exponent such as e=3, a Bleichenbacher-style forgery becomes feasible. There is no public exploit identified at time of analysis and it is not in CISA KEV, but the impersonation impact against IKEv1 raw-RSA authentication makes this a high-severity issue (CVSS 8.1); remote code execution is explicitly not possible and X.509 certificate verification is unaffected.

Peer impersonation and denial-of-service in Libreswan IPsec/IKEv2 arises from improper DER/ASN.1 digest verification in RSA_authenticate_hash_signature_pkcs1_1_5_rsa() when the IKEv2 AUTH payload uses RSASSA-PKCS1-v1_5 signatures. A remote unauthenticated attacker can mount a Bleichenbacher-style forgery to impersonate a peer when small RSA public exponents (e.g., e=3) are in use, or send an undersized hash to trip an assertion that aborts and restarts the daemon for sustained DoS. A vendor patch is available and there is no public exploit identified at time of analysis; RCE is not possible and X.509 certificate verification of the peer is unaffected.

Denial of service in the Libreswan IPsec VPN's pluto daemon allows remote unauthenticated attackers to crash and repeatedly restart the daemon by sending an invalidly formatted IKEv2 fragment. The off-by-one flaw affects any deployment permitting IKEv2 connections that do not explicitly set fragmentation=no, with no authentication or user interaction required; repeated exploitation sustains the outage. No public exploit identified at time of analysis, and no remote code execution is possible despite the mislabeled 'RCE' tag.

An issue was discovered in Libreswan 3.x and 4.x before 4.12. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

An issue was discovered in Libreswan before 4.12. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

An issue was discovered in Libreswan before 4.12. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

pluto in Libreswan before 4.11 allows a denial of service (responder SPI mishandling and daemon crash) via unauthenticated IKEv1 Aggressive Mode packets. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A vulnerability was found in the libreswan library. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker could use this flaw to crash libreswan by sending. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Out-of-bounds Read vulnerability could allow attackers to read data from memory outside the intended buffer boundaries.

The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity protected using the established IKE SA encryption and. Rated low severity (CVSS 3.1), this vulnerability is remotely exploitable.

In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

libreswan before 3.18 allows remote attackers to cause a denial of service (NULL pointer dereference and pluto daemon restart). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

programs/pluto/ikev1.c in libreswan before 3.17 retransmits in initial-responder states, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed UDP packet. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Libreswan 3.16 might allow remote attackers to cause a denial of service (daemon restart) via an IKEv2 aes_xcbc transform. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The pluto IKE daemon in libreswan before 3.15 and Openswan before 2.6.45, when built with NSS, allows remote attackers to cause a denial of service (assertion failure and daemon restart) via a zero. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. No vendor patch available.

libreswan 3.9 through 3.12 allows remote attackers to cause a denial of service (daemon restart) via an IKEv1 packet with (1) unassigned bits set in the IPSEC DOI value or (2) the next payload value. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Libreswan 3.7 and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and IKE daemon restart) via IKEv2 packets that lack expected payloads. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

The ikev2parent_inI1outR1 function in pluto/ikev2_parent.c in libreswan before 3.7 allows remote attackers to cause a denial of service (restart) via an IKEv2 I1 notification without a KE payload. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Race condition in the libreswan.spec files for Red Hat Enterprise Linux (RHEL) and Fedora packages in libreswan 3.6 has unspecified impact and attack vectors, involving the /var/tmp/libreswan-nss-pwd. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available.

Libreswan 3.6 allows remote attackers to cause a denial of service (crash) via a small length value and (1) no version or (2) an invalid major number in an IKE packet. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity.

Buffer overflow in the atodn function in libreswan 3.0 and 3.1, when Opportunistic Encryption is enabled and an RSA key is being used, allows remote attackers to cause a denial of service (pluto IKE. Rated medium severity (CVSS 5.1), this vulnerability is remotely exploitable.