| Name | CVE-2023-27534 |
| Description | A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user's home directory. Attackers can exploit this flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a server with a specific user. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3763-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| curl (PTS) | bullseye | 7.74.0-1.3+deb11u13 | fixed |
| bullseye (security) | 7.74.0-1.3+deb11u11 | fixed |
| bookworm | 7.88.1-10+deb12u7 | fixed |
| bookworm (security) | 7.88.1-10+deb12u5 | fixed |
| trixie | 8.9.1-2 | fixed |
| sid | 8.10.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | buster | 7.64.0-4+deb10u9 | | DLA-3763-1 | |
| curl | source | bullseye | 7.74.0-1.3+deb11u8 | | | |
| curl | source | (unstable) | 7.88.1-7 | | | |
Notes
https://curl.se/docs/CVE-2023-27534.html
Introduced by: https://github.com/curl/curl/commit/ba6f20a2442ab1ebfe947cff19a552f92114a29a (curl-7_18_0)
Fixed by: https://github.com/curl/curl/commit/4e2b52b5f7a3bf50a0f1494155717b02cc1df6d6 (curl-8_0_0)
Regression fix: https://github.com/curl/curl/commit/91b53efa4b6854dc3688f55bfb329b0cafcf5325 (curl-8_1_0)