Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1oZjU0LWZxMm0tcDl2Ns4AA8Eb

dotmesh arbitrary file read and/or write

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.

Permalink: https://github.com/advisories/GHSA-hf54-fq2m-p9v6
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1oZjU0LWZxMm0tcDl2Ns4AA8Eb
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 6 months ago
Updated: 6 months ago

CVSS Score: 8.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Identifiers: GHSA-hf54-fq2m-p9v6, CVE-2020-26312
References:

• https://nvd.nist.gov/vuln/detail/CVE-2020-26312
• https://github.com/dotmesh-io/dotmesh/blob/master/pkg/archiver/tar.go#L255
• https://securitylab.github.com/advisories/GHSL-2020-254-zipslip-dotmesh
• https://github.com/advisories/GHSA-hf54-fq2m-p9v6

Repository: https://github.com/dotmesh-io/dotmesh
Blast Radius: 1.0

Affected Packages