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CVE-2021-41991

Status Candidate

Overview

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.

Related Files

Debian Security Advisory 4989-1
Posted Oct 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4989-1 - Researchers at the United States of America National Security Agency (NSA) identified two denial of services vulnerability in strongSwan, an IKE/IPsec suite.

tags | advisory, denial of service
systems | linux, debian
advisories | CVE-2021-41990, CVE-2021-41991
SHA-256 | 232a30dd171d73173c62899a6b754e2031ebe12470c78f293d68f6b6dcaeb40d
Ubuntu Security Notice USN-5111-2
Posted Oct 20, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5111-2 - USN-5111-1 fixed a vulnerability in strongSwan. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. It was discovered that strongSwan incorrectly handled replacing certificates in the cache. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-41991
SHA-256 | 10e3c393e6b2b8c356a47c0b00aa000351147ce20e3e3107dc7cfdb02f631db9
Ubuntu Security Notice USN-5111-1
Posted Oct 19, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5111-1 - It was discovered that strongSwan incorrectly handled certain RSASSA-PSS signatures. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service. It was discovered that strongSwan incorrectly handled replacing certificates in the cache. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-41990, CVE-2021-41991
SHA-256 | b99059137da4616ef9e1d0bf1cda5fd4a8bdd3416d2cfcce76a73aafa32fff84
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