A heap buffer overread was found in perl's grok_bslash_N() function, which is used in the compilation of Unicode nodes in regular expressions, possibly leading to crash or dump of memory segments via the error output. An attacker, able to provide a specially crafted regular expression, could look for sensible information in the error message, or crash perl.
Find out more about CVE-2017-12883 from the MITRE CVE dictionary dictionary and NIST NVD.
Perl as shipped in Red Hat Enterprise Linux 7 and older have not been found to be vulnerable. This vulnerability was not present in perl versions older than 5.20.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-perl524-perl | Will not fix |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-perl520-perl | Not affected |
| Red Hat Enterprise Linux 7 | perl | Not affected |
| Red Hat Enterprise Linux 6 | perl | Not affected |
| Red Hat Enterprise Linux 5 | perl | Not affected |
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