CVE-2017-9445
A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 54.8%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 54.84% probability · 99th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- systemd project/systemd
- Source
- cve@mitre.org
References
- http://openwall.com/lists/oss-security/2017/06/27/8Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/99302Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038806Third Party Advisory, VDB Entry
- https://launchpad.net/bugs/1695546Broken Link
- http://openwall.com/lists/oss-security/2017/06/27/8Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/99302Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038806Third Party Advisory, VDB Entry
- https://launchpad.net/bugs/1695546Broken Link
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.