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Updated: 2022-06-02 11:32:50.80507


Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap buffer overflow when octet-counted framing is used. This can result in a segfault or some other malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But there may still be a slight chance for experts to do that. The bug occurs when the octet count is read. While there is a check for the maximum number of octets, digits are written to a heap buffer even when the octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing modes. It is relatively uncommon, but enabled by default on receivers. Modules `imtcp`, `imptcp`, `imgssapi`, and `imhttp` are used for regular syslog message reception. It is best practice not to directly expose them to the public. When this practice is followed, the risk is considerably lower. Module `imdiag` is a diagnostics module primarily intended for testbench runs. We do not expect it to be present on any production installation. Octet-counted framing is not very common. Usually, it needs to be specifically enabled at senders. If users do not need it, they can turn it off for the most important modules. This will mitigate the vulnerability.



Severity Score
CVSS Version 2.x MEDIUM 6.8
CVSS Version 3.x HIGH 8.1


OS name Project name Version Status Errata Last updated
CentOS 6 ELS rsyslog 5.8.10 Released CLSA-2022:1654717777 2022-06-22 08:37:52.38585
CentOS 8.4 ELS rsyslog 8.1911.0 Released CLSA-2022:1652706426 2022-05-12 07:50:26.945343
CentOS 8.5 ELS rsyslog 8.2102.0 Released CLSA-2022:1652706523 2022-05-12 07:50:27.789445
CloudLinux 6 ELS rsyslog 5.8.10 Released CLSA-2022:1654717518 2022-06-22 08:37:52.245368
Oracle Linux 6 ELS rsyslog 5.8.10 Released CLSA-2022:1654710004 2022-06-08 14:48:29.368027
Ubuntu 16.04 ELS rsyslog 8.16.0-1ubuntu3.1 Released CLSA-2022:1653917271 2022-05-30 11:37:26.064781