CVE-2022-41715 Memory exhaustion when compiling regular expressions in regexp/syntax
Attackers can cause memory exhaustion and denial of service by providing specially crafted regular expressions to applications using the Go regexp/syntax package.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-41715?
CVE-2022-41715 is a high-severity denial of service vulnerability in Golang Go, published on 14 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Programs which compile regular expressions from untrusted sources may be vulnerable to memory exhaustion or denial of service. The parsed regexp representation is linear in the size of the input, but in some cases the constant factor can be as high as 40,000, making relatively small regexps consume much larger amounts of memory. After fix, each regexp being parsed is limited to a 256 MB memory footprint. Regular expressions whose representation would use more space than that are rejected. Normal use of regular expressions is unaffected.
Which versions are affected by CVE-2022-41715?
2 open source packages ship an affected version, including golang and stdlib. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.18.7, 1.19.2 |
stdlib Go | All versions | 1.18.7, 1.19.2 |
Linux distribution packages (5)
golang-github-cpuguy83-md2man AlmaLinux:9 | All versions | 2.0.2-4.el9 |
golang-github-cpuguy83-md2man Red Hat:enterprise_linux:9::crb | All versions | 0:2.0.2-4.el9 |
golang-github-cpuguy83-md2man-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:2.0.2-4.el9 |
golang-github-cpuguy83-md2man-debugsource Red Hat:enterprise_linux:9::crb | All versions | 0:2.0.2-4.el9 |
golang-github-prometheus-prometheus openSUSE:Tumbleweed | All versions | 2.48.1-2.1 |
Products include Golang Go.
How do I fix CVE-2022-41715?
Upgrade golang to a fixed version for your release line: 1.18.7 or 1.19.2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-41715 being exploited?
There is no known exploitation of CVE-2022-41715 in the wild and no public exploit code.
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- CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go
- CVE-2023-24540 Improper handling of JavaScript whitespace in html/template
Sources
Also known as ALSA-2023:2592, AZL-11130, AZL-37407, AZL-78964, AZL-98745, BIT-golang-2022-41715 and 6 more.