Systemd-coredump: race condition that allows a local attacker to crash a suid program and gain read access to the resulting core dump

A vulnerability was found in systemd-coredump. This flaw allows an attacker to force a SUID process to crash and replace it with a non-SUID binary to access the original's privileged process coredump, allowing the attacker to read sensitive data, such as /etc/shadow content, loaded by the original process. A SUID binary or process has a special type of permission, which allows the process to run with the file owner's permissions, regardless of the user executing the binary. This allows the process to access more restricted data than unprivileged users or processes would be able to. An attacker can leverage this flaw by forcing a SUID process to crash and force the Linux kernel to recycle the process PID before systemd-coredump can analyze the /proc/pid/auxv file. If the attacker wins the race condition, they gain access to the original's SUID process coredump file. They can read sensitive content loaded into memory by the original binary, affecting data confidentiality.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

信号处理例程中的竞争条件

Linux systemd-coredump 安全漏洞

Linux systemd-coredump是Linux基金会的一个系统服务， 它能从操作系统内核中获取内存转储，并能对获取到的数据进行各种处理。 Linux systemd-coredump存在安全漏洞，该漏洞源于竞争条件，可能导致敏感数据泄露。

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