CVE-2015-3217
Published: 13 December 2016
PCRE 7.8 and 8.32 through 8.37, and PCRE2 10.10 mishandle group empty matches, which might allow remote attackers to cause a denial of service (stack-based buffer overflow) via a crafted regular expression, as demonstrated by /^(?:(?(1)\\.|([^\\\\W_])?)+)+$/.
Notes
| Author | Note |
|---|---|
| seth-arnold | This might be disputed, Tavis says it is likely php misusing the pcre3 API. I suspect allowing attackers to supply regular expressions is always going to be a bad idea. |
| mdeslaur | upsteam bug says this is an issue with php, and are not going to fix, so marking this as not-affected |
Priority
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |