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Extended Attributes

6f6b5a3c-a2d4-4b14-892d-a57ca6dd2ba8

Extended Attributes

Node Details

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Updated5/1/2026

PageRank0.0000

Effectiveness0.000

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4 linked nodes

PERTAIN_TOReport

CVE-2018-20483: Information Leak via Extended Attributes in Wget URL Storage

PERTAIN_TOProblem

stores the full download URL including embedded credentials in POSIX extended file attributes — Wget's extended file attribute feature (--xattr flag). Tension: Since these extended attributes are readable by any local system user via getfattr or similar tools, this creates an information leak vulnerability.

PERTAIN_TORootCause

The set_file_metadata function in src/xattr.c. Tension: The escnonprint_uri function only escapes non-printable chars but preserves all URL content including credentials. Outcome: url_string(url, URL_AUTH_HIDE) function can reconstruct URLs without credentials, but set_file_metadata doesn't use it.

PERTAIN_TOSolution

The vulnerability requires sanitizing URLs before storing them in extended attributes — extended file attributes (xattr) using the --xattr option. Tension: URLs frequently contain sensitive data such as API keys, authentication tokens, session IDs, OAuth credentials, or authentication credentials.

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