Debian: Security Advisory for strongswan (DSA-4989-1)

Published: 2021-10-20 01:00:05
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N

Summary:
The remote host is missing an update for the 'strongswan' Linux Distribution Package(s) announced via the DSA-4989-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Researchers at the United States of America National Security Agency (NSA) identified two denial of services vulnerability in strongSwan, an IKE/IPsec suite. CVE-2021-41990 RSASSA-PSS signatures whose parameters define a very high salt length can trigger an integer overflow that can lead to a segmentation fault. Generating a signature that bypasses the padding check to trigger the crash requires access to the private key that signed the certificate. However, the certificate does not have to be trusted. Because the gmp and the openssl plugins both check if a parsed certificate is self-signed (and the signature is valid), this can e.g. be triggered by an unrelated self-signed CA certificate sent by an initiator. CVE-2021-41991 Once the in-memory certificate cache is full it tries to randomly replace lesser used entries. Depending on the generated random value, this could lead to an integer overflow that results in a double-dereference and a call using out-of-bounds memory that most likely leads to a segmentation fault. Remote code execution can't be ruled out completely, but attackers have no control over the dereferenced memory, so it seems unlikely at this point.

Affected Versions:
'strongswan' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For the oldstable distribution (buster), these problems have been fixed in version 5.7.2-1+deb10u1. For the stable distribution (bullseye), these problems have been fixed in version 5.9.1-1+deb11u1. We recommend that you upgrade your strongswan Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-41990
https://nvd.nist.gov/vuln/detail/CVE-2021-41991

References:

https://www.debian.org/security/2021/dsa-4989.html
https://security-tracker.debian.org/tracker/DSA-4989-1

Severity
Medium
CVSS Score
5.0
Published
2021-10-20
Modified
2021-10-20
Category
Debian Local Security Checks

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