CUPS has an integer underflow in `_ppdCreateFromIPP` causes root cupsd crash via negative `job-password-supported`

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an attacker can repeat the crash for sustained denial of service.

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

整数下溢(超界折返)

OpenPrinting CUPS 数字错误漏洞

OpenPrinting CUPS是OpenPrinting公司的一个适用于 Linux® 和其他类 Unix® 操作系统的基于标准的开源打印系统。 OpenPrinting CUPS 2.4.16及之前版本存在数字错误漏洞，该漏洞源于_ppdCreateFromIPP函数存在整数下溢，可能导致拒绝服务攻击。

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