CVE-2017-1000254 (GCVE-0-2017-1000254)

Vulnerability from cvelistv5 – Published: 2017-10-06 13:00 – Updated: 2024-08-05 22:00
VLAI?
Summary
libcurl may read outside of a heap allocated buffer when doing FTP. When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
https://security.gentoo.org/glsa/201712-04 vendor-advisoryx_refsource_GENTOO
https://access.redhat.com/errata/RHSA-2018:3558 vendor-advisoryx_refsource_REDHAT
https://support.apple.com/HT208331 x_refsource_CONFIRM
http://www.securitytracker.com/id/1039509 vdb-entryx_refsource_SECTRACK
https://curl.haxx.se/673d0cd8.patch x_refsource_CONFIRM
https://curl.haxx.se/docs/adv_20171004.html x_refsource_CONFIRM
https://access.redhat.com/errata/RHSA-2018:2486 vendor-advisoryx_refsource_REDHAT
http://www.debian.org/security/2017/dsa-3992 vendor-advisoryx_refsource_DEBIAN
http://www.securityfocus.com/bid/101115 vdb-entryx_refsource_BID
https://lists.apache.org/thread.html/rf4c02775860… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r58af02e294b… mailing-listx_refsource_MLIST
Show details on NVD website
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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