HistoryEdit

RUSTSEC-2017-0004

Integer overflow leads to heap-based buffer overflow in encode_config_buf

Issued
Package
base64 (crates.io)
Type
Vulnerability
Keywords
#memory-corruption
Aliases
Details
https://github.com/alicemaz/rust-base64/commit/24ead980daf11ba563e4fb2516187a56a71ad319
CVSS Score
9.8 CRITICAL
CVSS Details
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Patched
  • >=0.5.2
Keywords
#memory-corruption

Description

Affected versions of this crate suffered from an integer overflow bug when calculating the size of a buffer to use when encoding base64 using the encode_config_buf and encode_config functions. If the input string was large, this would cause a buffer to be allocated that was too small. Since this function writes to the buffer using unsafe code, it would allow an attacker to write beyond the buffer, causing memory corruption and possibly the execution of arbitrary code.

This flaw was corrected by using checked arithmetic to calculate the size of the buffer.