CVE-2023-6857 — Race Condition in Mozilla Firefox

CWE-362 — Race ConditionCWE-363 — Race Condition Enabling Link Following14 documents8 sources
Severity
5.3MEDIUMNVD
OSV4.3
EPSS
0.2%
top 59.22%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird+1 more
Timeline
PublishedDec 19
Latest updateJan 11

Description

When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:NExploitability: 1.6 | Impact: 3.6

Affected Packages9 packages

▶CVEListV5mozilla/firefoxunspecified — 121
▶NVDmozilla/firefox< 121.0
▶CVEListV5mozilla/firefox_esrunspecified — 115.6
▶NVDmozilla/firefox_esr< 115.6
▶Ubuntumozilla/firefox< 121.0+build1-0ubuntu0.20.04.1

Also affects: Debian Linux 10.0, 11.0, 12.0

🔴Vulnerability Details

6
OSV
firefox regressions↗2024-01-11
▶
OSV
thunderbird vulnerabilities↗2024-01-02
▶
OSV
firefox vulnerabilities↗2024-01-02
▶
CVEList
CVE-2023-6857: When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary↗2023-12-19
▶
GHSA
GHSA-8fq6-p869-285x: When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary↗2023-12-19
▶

📋Vendor Advisories

7
Ubuntu
Firefox vulnerabilities↗2024-01-02
▶
Ubuntu
Thunderbird vulnerabilities↗2024-01-02
▶
Red Hat
Mozilla: Symlinks may resolve to smaller than expected buffers↗2023-12-19
▶
Debian
CVE-2023-6857: firefox - When resolving a symlink, a race may occur where the buffer passed to `readlink`...↗2023
▶
Mozilla
Mozilla Foundation Security Advisory 2023-56: CVE-2023-6857↗
▶
CVE-2023-6857 — Race Condition in Mozilla Firefox | cvebase