CVE-2020-26312— Dotmesh 安全漏洞

GHSL-2020-254: Arbitrary file read and/or write in dotmesh

Dotmesh is a git-like command-line interface for capturing, organizing and sharing application states. In versions 0.8.1 and prior, the unsafe handling of symbolic links in an unpacking routine may enable attackers to read and/or write to arbitrary locations outside the designated target folder. The routine `untarFile` attempts to guard against creating symbolic links that point outside the directory a tar archive is extracted to. However, a malicious tarball first linking `subdir/parent` to `..` (allowed, because `subdir/..` falls within the archive root) and then linking `subdir/parent/escapes` to `..` results in a symbolic link pointing to the tarball’s parent directory, contrary to the routine’s goals. This issue may lead to arbitrary file write (with same permissions as the program running the unpack operation) if the attacker can control the archive file. Additionally, if the attacker has read access to the unpacked files, they may be able to read arbitrary system files the parent process has permissions to read. As of time of publication, no patch for this issue is available.

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

跨界内存写

Dotmesh 安全漏洞

Dotmesh是Dotscience开源的一个类似 git 的 CLI。用于捕获、组织和共享应用程序状态。 Dotmesh 0.8.1及之前版本存在安全漏洞，该漏洞源于解包例程中对符号链接的不安全处理，可能使攻击者能够读取和写入指定目标文件夹之外的任意位置。

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