CVE-2021-29922

moderate-risk
Published 2021-08-07

library/std/src/net/parser.rs in Rust before 1.53.0 does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation.

Do I need to act?

-
0.33% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.1/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Rust-Lang

References (12)

Third Party Advisory https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis
Vendor Advisory https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html
Exploit https://github.com/rust-lang/rust/issues/83648
Patch https://github.com/rust-lang/rust/pull/83652
Exploit https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md
Third Party Advisory https://security.gentoo.org/glsa/202210-09
Third Party Advisory https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis
Vendor Advisory https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html
Exploit https://github.com/rust-lang/rust/issues/83648
Patch https://github.com/rust-lang/rust/pull/83652
Exploit https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md
Third Party Advisory https://security.gentoo.org/glsa/202210-09
37
/ 100
moderate-risk
Severity 31/34 · Critical
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal