CVE-2021-41991
Published: 18 October 2021
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.
Notes
| Author | Note |
|---|---|
| mdeslaur | affects 4.2.10+ |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
strongswan Launchpad, Ubuntu, Debian |
focal |
Released
(5.8.2-1ubuntu3.3)
|
| hirsute |
Released
(5.9.1-1ubuntu1.2)
|
|
| impish |
Released
(5.9.1-1ubuntu3.1)
|
|
| jammy |
Released
(5.9.1-1ubuntu3.1)
|
|
| trusty |
Released
(5.1.2-0ubuntu2.11+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| xenial |
Released
(5.3.5-1ubuntu3.8+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| bionic |
Released
(5.6.2-1ubuntu2.7)
|
|
| upstream |
Needs triage
|
|
| kinetic |
Released
(5.9.1-1ubuntu3.1)
|
|
| lunar |
Released
(5.9.1-1ubuntu3.1)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |