ghsa-m5pq-gvj9-9vr8
Vulnerability from github
This is a cross-post of the official security advisory. The official advisory contains a signed version with our PGP key, as well.
The Rust Security Response WG was notified that the regex crate did not properly limit the complexity of the regular expressions (regex) it parses. An attacker could use this security issue to perform a denial of service, by sending a specially crafted regex to a service accepting untrusted regexes. No known vulnerability is present when parsing untrusted input with trusted regexes.
This issue has been assigned CVE-2022-24713. The severity of this vulnerability is "high" when the regex crate is used to parse untrusted regexes. Other uses of the regex crate are not affected by this vulnerability.
Overview
The regex crate features built-in mitigations to prevent denial of service attacks caused by untrusted regexes, or untrusted input matched by trusted regexes. Those (tunable) mitigations already provide sane defaults to prevent attacks. This guarantee is documented and it's considered part of the crate's API.
Unfortunately a bug was discovered in the mitigations designed to prevent untrusted regexes to take an arbitrary amount of time during parsing, and it's possible to craft regexes that bypass such mitigations. This makes it possible to perform denial of service attacks by sending specially crafted regexes to services accepting user-controlled, untrusted regexes.
Affected versions
All versions of the regex crate before or equal to 1.5.4 are affected by this issue. The fix is include starting from regex 1.5.5.
Mitigations
We recommend everyone accepting user-controlled regexes to upgrade immediately to the latest version of the regex crate.
Unfortunately there is no fixed set of problematic regexes, as there are practically infinite regexes that could be crafted to exploit this vulnerability. Because of this, we do not recommend denying known problematic regexes.
Acknowledgements
We want to thank Addison Crump for responsibly disclosing this to us according to the Rust security policy, and for helping review the fix.
We also want to thank Andrew Gallant for developing the fix, and Pietro Albini for coordinating the disclosure and writing this advisory.
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "regex"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2022-24713"
],
"database_specific": {
"cwe_ids": [
"CWE-1333",
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2022-03-08T20:00:36Z",
"nvd_published_at": "2022-03-08T19:15:00Z",
"severity": "HIGH"
},
"details": "\u003e This is a cross-post of [the official security advisory][advisory]. The official advisory contains a signed version with our PGP key, as well.\n\n[advisory]: https://groups.google.com/g/rustlang-security-announcements/c/NcNNL1Jq7Yw\n\nThe Rust Security Response WG was notified that the `regex` crate did not properly limit the complexity of the regular expressions (regex) it parses. An attacker could use this security issue to perform a denial of service, by sending a specially crafted regex to a service accepting untrusted regexes. No known vulnerability is present when parsing untrusted input with trusted regexes.\n\nThis issue has been assigned CVE-2022-24713. The severity of this vulnerability is \"high\" when the `regex` crate is used to parse untrusted regexes. Other uses of the `regex` crate are not affected by this vulnerability.\n\n## Overview\n\nThe `regex` crate features built-in mitigations to prevent denial of service attacks caused by untrusted regexes, or untrusted input matched by trusted regexes. Those (tunable) mitigations already provide sane defaults to prevent attacks. This guarantee is documented and it\u0027s considered part of the crate\u0027s API.\n\nUnfortunately a bug was discovered in the mitigations designed to prevent untrusted regexes to take an arbitrary amount of time during parsing, and it\u0027s possible to craft regexes that bypass such mitigations. This makes it possible to perform denial of service attacks by sending specially crafted regexes to services accepting user-controlled, untrusted regexes.\n\n## Affected versions\n\nAll versions of the `regex` crate before or equal to 1.5.4 are affected by this issue. The fix is include starting from `regex` 1.5.5.\n\n## Mitigations\n\nWe recommend everyone accepting user-controlled regexes to upgrade immediately to the latest version of the `regex` crate.\n\nUnfortunately there is no fixed set of problematic regexes, as there are practically infinite regexes that could be crafted to exploit this vulnerability. Because of this, we do not recommend denying known problematic regexes.\n\n## Acknowledgements\n\nWe want to thank Addison Crump for responsibly disclosing this to us according to the [Rust security policy](https://www.rust-lang.org/policies/security), and for helping review the fix.\n\nWe also want to thank Andrew Gallant for developing the fix, and Pietro Albini for coordinating the disclosure and writing this advisory.",
"id": "GHSA-m5pq-gvj9-9vr8",
"modified": "2022-08-11T20:38:52Z",
"published": "2022-03-08T20:00:36Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/rust-lang/regex/security/advisories/GHSA-m5pq-gvj9-9vr8"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-24713"
},
{
"type": "WEB",
"url": "https://github.com/rust-lang/regex/commit/ae70b41d4f46641dbc45c7a4f87954aea356283e"
},
{
"type": "WEB",
"url": "https://github.com/rust-lang/regex"
},
{
"type": "WEB",
"url": "https://groups.google.com/g/rustlang-security-announcements/c/NcNNL1Jq7Yw"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00003.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00009.html"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JANLZ3JXWJR7FSHE57K66UIZUIJZI67T"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O3YB7CURSG64CIPCDPNMGPE4UU24AB6H"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PDOWTHNVGBOP2HN27PUFIGRYNSNDTYRJ"
},
{
"type": "WEB",
"url": "https://rustsec.org/advisories/RUSTSEC-2022-0013.html"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-08"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-14"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2022/dsa-5113"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2022/dsa-5118"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Rust\u0027s regex crate vulnerable to regular expression denial of service"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.