CVE-2023-38545
This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 78.5%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 78.48% probability · 100th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- haxx/libcurl · fedoraproject/fedora · netapp/active iq unified manager · netapp/oncommand insight · netapp/oncommand workflow automation · microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 21h2 · microsoft/windows 11 22h2 · microsoft/windows 11 23h2 · microsoft/windows server 2019 · microsoft/windows server 2022
- Source
- support@hackerone.com
References
- http://seclists.org/fulldisclosure/2024/Jan/34Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2024/Jan/37Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2024/Jan/38Mailing List, Third Party Advisory
- https://curl.se/docs/CVE-2023-38545.htmlPatch, Third Party Advisory
- https://forum.vmssoftware.com/viewtopic.php?f=8&t=8868
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20231027-0009/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20240201-0005/Third Party Advisory
- https://support.apple.com/kb/HT214036Third Party Advisory
- https://support.apple.com/kb/HT214057Third Party Advisory
- https://support.apple.com/kb/HT214058Third Party Advisory
- https://support.apple.com/kb/HT214063Third Party Advisory
- https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/Patch, Third Party Advisory
- http://seclists.org/fulldisclosure/2024/Jan/34Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2024/Jan/37Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2024/Jan/38Mailing List, Third Party Advisory
- https://curl.se/docs/CVE-2023-38545.htmlPatch, Third Party Advisory
- https://forum.vmssoftware.com/viewtopic.php?f=8&t=8868
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20231027-0009/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20240201-0005/Third Party Advisory
- https://support.apple.com/kb/HT214036Third Party Advisory
- https://support.apple.com/kb/HT214057Third Party Advisory
- https://support.apple.com/kb/HT214058Third Party Advisory
- https://support.apple.com/kb/HT214063Third Party Advisory
- https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-093430.html
- https://cert-portal.siemens.com/productcert/html/ssa-507364.html
- https://cert-portal.siemens.com/productcert/html/ssa-832273.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.