modern-tar 0.3.5 through 0.8.5 contains a memory exhaustion vulnerability that allows attackers to produce negative entry sizes via non-octal bytes parsed by readOctal(). Attackers can supply a crafted, optionally gzip-compressed, archive to unpackTar() that buffers chunks indefinitely, exhausting process memory and suppressing later entries.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/ayuhito/modern-tar
disclosure@vulncheck.com
https://github.com/ayuhito/modern-tar/blob/v0.8.5/src/tar/encoding.ts
disclosure@vulncheck.com
https://github.com/ayuhito/modern-tar/commit/181c8cb75351867535057817ada4802a90…
disclosure@vulncheck.com
https://github.com/ayuhito/modern-tar/pull/195
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/modern-tar-0.3.5-through-0.8.5-memory-exha…
disclosure@vulncheck.com