The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13, a brace pattern with a zero step value (e.g., `{1..2..0}`) causes the sequence generation loop to run indefinitely, making the process hang for seconds and allocate heaps of memory. Versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13 fix the issue.
As a workaround, sanitize strings passed to `expand()` to ensure a step value of `0` is not used.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 10
https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8d…
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8d…
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/commit/311ac0d54994158c0a384e28…
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/commit/7fd684f89fdde3549563d0a6…
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/commit/b9cacd9e55e7a1fa588fe4b7…
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/issues/98
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/pull/95
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/pull/96
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/pull/97
security-advisories@github.com
https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-f886-m…
security-advisories@github.com