| Name | CVE-2021-41991 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2788-1, DSA-4989-1, ELA-641-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| strongswan (PTS) | jessie, jessie (lts) | 5.2.1-6+deb8u11 | fixed |
| stretch (security) | 5.5.1-4+deb9u6 | fixed | |
| stretch (lts), stretch | 5.5.1-4+deb9u7 | fixed | |
| buster (security), buster, buster (lts) | 5.7.2-1+deb10u4 | fixed | |
| bullseye (security), bullseye | 5.9.1-1+deb11u4 | fixed | |
| bookworm (security), bookworm | 5.9.8-5+deb12u1 | fixed | |
| sid, trixie | 5.9.13-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| strongswan | source | jessie | 5.2.1-6+deb8u9 | ELA-641-1 | ||
| strongswan | source | stretch | 5.5.1-4+deb9u5 | DLA-2788-1 | ||
| strongswan | source | buster | 5.7.2-1+deb10u1 | DSA-4989-1 | ||
| strongswan | source | bullseye | 5.9.1-1+deb11u1 | DSA-4989-1 | ||
| strongswan | source | (unstable) | 5.9.4-1 |
https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html