URL 传输库 cURL 中用于从 TFTP 服务器接收数据的函数 tftp_receive_packet() 包含堆缓冲区溢出。该函数会使用缓冲区的默认大小调用 recvfrom()，而不是用于分配缓冲区的大小。因此，可能覆写堆内存的内容完全受服务器控制。对于 Debian 8“Jessie”，此问题已在 7.38.0-4~deb8u15 版本中修复。建议您升级 curl 程序包。注意：Tenable Network Security 已直接从 DLA 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行自动整理和排版。

远程 Redhat Enterprise Linux 7 主机上安装的程序包受到 RHSA-2020:1020 公告中提及的漏洞的影响。

  - curl：tftp_receive_packet() 函数中存在 TFTP 接收堆缓冲区溢出 (CVE-2019-5436)

请注意，Nessus 并未测试此问题，而是只依靠应用程序自我报告的版本号。

An update of the cmake package has been released.

curl security problems :

CVE-2019-5435: Integer overflows in curl_url_set()

libcurl contains two integer overflows in the curl_url_set() function that if triggered, can lead to a too small buffer allocation and a subsequent heap buffer overflow.

The flaws only exist on 32 bit architectures and require excessive string input lengths.

CVE-2019-5436: TFTP receive buffer overflow

libcurl contains a heap buffer overflow in the function (tftp_receive_packet()) that recevives data from a TFTP server. It calls recvfrom() with the default size for the buffer rather than with the size that was used to allocate it. Thus, the content that might overwrite the heap memory is entirely controlled by the server.

The flaw exists if the user selects to use a 'blksize' of 504 or smaller (default is 512). The smaller size that is used, the larger the possible overflow becomes.

Users chosing a smaller size than default should be rare as the primary use case for changing the size is to make it larger.

It is rare for users to use TFTP across the Internet. It is most commonly used within local networks.

This update for curl fixes the following issues :

Security issue fixed :

CVE-2019-5436: Fixed a heap buffer overflow exists in tftp_receive_packet that receives data from a TFTP server (bsc#1135170).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- fix TFTP receive buffer overflow (CVE-2019-5436)

  - fix integer overflows in curl_url_set() (CVE-2019-5435)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An integer overflow in curl's URL API results in a buffer overflow in libcurl. (CVE-2019-5435)

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl. (CVE-2019-5436)

According to the version of the curl packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - A heap buffer overflow in the TFTP receiving code     allows for DoS or arbitrary code execution in libcurl     versions 7.19.4 through 7.64.1.(CVE-2019-5436)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the curl packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - A heap buffer overflow in the TFTP receiving code     allows for DoS or arbitrary code execution in libcurl     versions 7.19.4 through 7.64.1.(CVE-2019-5436)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2020:1020 advisory.

  - A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl     versions 7.19.4 through 7.64.1. (CVE-2019-5436)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
125410	Debian DLA-1804-1：curl 安全更新	Nessus	Debian Local Security Checks	2019/5/28	2024/5/21	high
126195	Photon OS 1.0：Curl PHSA-2019-1.0-0237	Nessus	PhotonOS Local Security Checks	2019/6/25	2024/5/14	high
135073	RHEL 7：curl (RHSA-2020:1020)	Nessus	Red Hat Local Security Checks	2020/4/1	2024/11/7	high
203839	Photon OS 3.0: Cmake PHSA-2023-3.0-0603	Nessus	PhotonOS Local Security Checks	2024/7/24	2024/7/24	critical
125441	FreeBSD : curl -- multiple vulnerabilities (dd343a2b-7ee7-11e9-a290-8ddc52868fa9)	Nessus	FreeBSD Local Security Checks	2019/5/28	2024/5/20	high
125470	SUSE SLED15 / SLES15 Security Update : curl (SUSE-SU-2019:1357-1)	Nessus	SuSE Local Security Checks	2019/5/28	2024/5/20	high
125786	Fedora 29 : curl (2019-697de0501f)	Nessus	Fedora Local Security Checks	2019/6/10	2024/5/16	high
126957	Amazon Linux 2 : curl (ALAS-2019-1233)	Nessus	Amazon Linux Local Security Checks	2019/7/24	2024/5/8	high
127023	EulerOS 2.0 SP8 : curl (EulerOS-SA-2019-1786)	Nessus	Huawei Local Security Checks	2019/7/25	2024/5/8	high
128101	EulerOS 2.0 SP5 : curl (EulerOS-SA-2019-1809)	Nessus	Huawei Local Security Checks	2019/8/23	2024/5/2	high
128927	EulerOS Virtualization for ARM 64 3.0.2.0 : curl (EulerOS-SA-2019-1924)	Nessus	Huawei Local Security Checks	2019/9/17	2024/4/25	high
135317	CentOS 7 : curl (RHSA-2020:1020)	Nessus	CentOS Local Security Checks	2020/4/10	2024/10/9	high

检测

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