Buffer overflow in TCP syslog server (receiver) components in rsyslog
概要
Buffer overflow in TCP syslog server (receiver) components in rsyslog
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
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.
出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Alpine Linux ALPINE-CVE-2022-24903 rsyslog 修正版: 8.2004.0-r2
- Debian DEBIAN-CVE-2022-24903 rsyslog 修正版: 8.2102.0-2+deb11u1
参照URL
- advisory github.com
- advisory github.com
- advisory lists.fedoraproject.org
- advisory nvd.nist.gov
- advisory security.netapp.com
- advisory debian.org
- patch github.com
- web lists.debian.org