Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS00M3cyLTlqNjItaHE5Oc4AAnWf

Buffer overflow in SmallVec::insert_many

A bug in the SmallVec::insert_many method caused it to allocate a buffer that was smaller than needed. It then wrote past the end of the buffer, causing a buffer overflow and memory corruption on the heap. This bug was only triggered if the iterator passed to insert_many yielded more items than the lower bound returned from its size_hint method.

The flaw was corrected in smallvec 0.6.14 and 1.6.1, by ensuring that additional space is always reserved for each item inserted. The fix also simplified the implementation of insert_many to use less unsafe code, so it is easier to verify its correctness.

Permalink: https://github.com/advisories/GHSA-43w2-9j62-hq99
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS00M3cyLTlqNjItaHE5Oc4AAnWf
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: almost 2 years ago
Updated: 7 months ago

CVSS Score: 9.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-43w2-9j62-hq99, CVE-2021-25900
References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-25900
• https://rustsec.org/advisories/RUSTSEC-2021-0003.html
• https://github.com/servo/rust-smallvec/issues/252
• https://github.com/servo/rust-smallvec/commit/5757ac500d4e544485d796b542e4e589749c291b
• https://github.com/servo/rust-smallvec/commit/9998ba0694a6b51aa6604748b00b6a98f0a0039e
• https://github.com/advisories/GHSA-43w2-9j62-hq99

Repository: https://github.com/servo/rust-smallvec
Blast Radius: 47.3

Affected Packages