CVE-2021-41991: Integer Overflow
First published: Mon Oct 18 2021(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/strongswan | 5.7.2-1+deb10u2 5.7.2-1+deb10u3 5.9.1-1+deb11u3 5.9.8-5 5.9.11-1 | |
| Strongswan Strongswan | >=4.2.10<5.9.4 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 | |
| Siemens SINEMA Remote Connect Server | ||
| Siemens Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail Firmware | ||
| Siemens Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail | ||
| Siemens Simatic Cp 1243-1 Firmware | ||
| Siemens Simatic Cp 1243-1 | ||
| Siemens Simatic Cp 1242-7 Gprs V2 Firmware | ||
| Siemens Simatic Cp 1242-7 Gprs V2 | ||
| Siemens Simatic Net Cp 1243-8 Irc Firmware | ||
| Siemens Simatic Net Cp 1243-8 Irc | ||
| Siemens Scalance Sc632-2c Firmware | ||
| Siemens Scalance Sc632-2c | ||
| Siemens Siplus Et 200sp Cp 1543sp-1 Isec Firmware | ||
| Siemens Siplus Et 200sp Cp 1543sp-1 Isec | ||
| Siemens Cp 1543-1 Firmware | ||
| Siemens Cp 1543-1 | ||
| Siemens Simatic Net Cp 1545-1 Firmware | ||
| Siemens Simatic Net Cp 1545-1 | ||
| Siemens Simatic Cp 1543sp-1 Firmware | ||
| Siemens Simatic Cp 1543sp-1 | ||
| Siemens Simatic Net Cp1243-7 Lte Eu Firmware | ||
| Siemens Simatic Net Cp1243-7 Lte Eu | ||
| Siemens Simatic Cp 1243-7 Lte\/us Firmware | ||
| Siemens Simatic Cp 1243-7 Lte\/us | ||
| Siemens Simatic Cp 1542sp-1 Firmware | ||
| Siemens Simatic Cp 1542sp-1 | ||
| Siemens Scalance Sc636-2c Firmware | ||
| Siemens Scalance Sc636-2c | ||
| Siemens Simatic Cp 1542sp-1 Irc Firmware | ||
| Siemens Simatic Cp 1542sp-1 Irc | ||
| Siemens Scalance Sc642-2c Firmware | ||
| Siemens Scalance Sc642-2c | ||
| Siemens Scalance Sc646-2c Firmware | <2.3 | |
| Siemens Scalance Sc646-2c | ||
| Siemens Scalance Sc622-2c Firmware | ||
| Siemens Scalance Sc622-2c | ||
| Siemens Siplus S7-1200 Cp 1243-1 Rail Firmware | ||
| Siemens Siplus S7-1200 Cp 1243-1 Rail | ||
| Siemens Siplus S7-1200 Cp 1243-1 Firmware | ||
| Siemens Siplus S7-1200 Cp 1243-1 | ||
| Siemens Siplus Net Cp 1543-1 Firmware | ||
| Siemens Siplus Net Cp 1543-1 | ||
| Siemens Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail Firmware | ||
| Siemens Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail |
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Reference Links
- https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html
- https://security-tracker.debian.org/tracker/CVE-2021-41991
- https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf
- https://github.com/strongswan/strongswan/releases/tag/5.9.4
- https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
- https://www.debian.org/security/2021/dsa-4989
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-41991.
What is the severity level of CVE-2021-41991?
The severity level of CVE-2021-41991 is high.
Which software versions are affected by CVE-2021-41991?
Versions of strongSwan before 5.9.4 are affected by CVE-2021-41991.
How can I fix CVE-2021-41991?
To fix CVE-2021-41991, upgrade to strongSwan version 5.9.4 or later.
Where can I find more information about CVE-2021-41991?
You can find more information about CVE-2021-41991 in the following references: [Link 1](https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf), [Link 2](https://github.com/strongswan/strongswan/releases/tag/5.9.4), [Link 3](https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html).
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/last-modified-date
- agent/weakness
- agent/author
- agent/severity
- agent/references
- agent/remedy
- agent/softwarecombine
- agent/tags
- agent/description
- agent/event
- collector/nvd-index
- agent/software-canonical-lookup-request
- package-manager/debian
- vendor/strongswan
- canonical/strongswan strongswan
- version/strongswan strongswan/4.2.10
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- version/debian debian linux/11.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34
- version/fedoraproject fedora/35
- vendor/siemens
- canonical/siemens sinema remote connect server
- canonical/siemens siplus et 200sp cp 1542sp-1 irc tx rail firmware
- canonical/siemens siplus et 200sp cp 1542sp-1 irc tx rail
- canonical/siemens simatic cp 1243-1 firmware
- canonical/siemens simatic cp 1243-1
- canonical/siemens simatic cp 1242-7 gprs v2 firmware
- canonical/siemens simatic cp 1242-7 gprs v2
- canonical/siemens simatic net cp 1243-8 irc firmware
- canonical/siemens simatic net cp 1243-8 irc
- canonical/siemens scalance sc632-2c firmware
- canonical/siemens scalance sc632-2c
- canonical/siemens siplus et 200sp cp 1543sp-1 isec firmware
- canonical/siemens siplus et 200sp cp 1543sp-1 isec
- canonical/siemens cp 1543-1 firmware
- canonical/siemens cp 1543-1
- canonical/siemens simatic net cp 1545-1 firmware
- canonical/siemens simatic net cp 1545-1
- canonical/siemens simatic cp 1543sp-1 firmware
- canonical/siemens simatic cp 1543sp-1
- canonical/siemens simatic net cp1243-7 lte eu firmware
- canonical/siemens simatic net cp1243-7 lte eu
- canonical/siemens simatic cp 1243-7 lte\/us firmware
- canonical/siemens simatic cp 1243-7 lte\/us
- canonical/siemens simatic cp 1542sp-1 firmware
- canonical/siemens simatic cp 1542sp-1
- canonical/siemens scalance sc636-2c firmware
- canonical/siemens scalance sc636-2c
- canonical/siemens simatic cp 1542sp-1 irc firmware
- canonical/siemens simatic cp 1542sp-1 irc
- canonical/siemens scalance sc642-2c firmware
- canonical/siemens scalance sc642-2c
- canonical/siemens scalance sc646-2c firmware
- canonical/siemens scalance sc646-2c
- canonical/siemens scalance sc622-2c firmware
- canonical/siemens scalance sc622-2c
- canonical/siemens siplus s7-1200 cp 1243-1 rail firmware
- canonical/siemens siplus s7-1200 cp 1243-1 rail
- canonical/siemens siplus s7-1200 cp 1243-1 firmware
- canonical/siemens siplus s7-1200 cp 1243-1
- canonical/siemens siplus net cp 1543-1 firmware
- canonical/siemens siplus net cp 1543-1
- canonical/siemens siplus et 200sp cp 1543sp-1 isec tx rail firmware
- canonical/siemens siplus et 200sp cp 1543sp-1 isec tx rail