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5.3
CVE-2023-33285: Buffer overflow in Qt DNS lookup function
CVE-2023-33285 · published 3 years ago
Summary
A security issue affects Qt's DNS lookup function in certain versions. An attacker could send a specially crafted DNS response to cause a crash or potentially execute malicious code on a system using Qt. Update to a fixed version of Qt to fix this issue.
What to do
- Update canonical qtbase-opensource-src to version 5.5.1+dfsg-16ubuntu7.7+esm1.
- Update canonical qtbase-opensource-src to version 5.9.5+dfsg-0ubuntu2.6+esm1.
- Update canonical qtbase-opensource-src to version 5.12.8+dfsg-0ubuntu2.1+esm1.
- Update canonical qtbase-opensource-src to version 5.15.3+dfsg-2ubuntu0.2+esm1.
- Update debian qt6-base to version 6.4.2+dfsg-10.
- Update debian qtbase-opensource-src to version 5.15.8+dfsg-11.
- Update debian qtbase-opensource-src-gles to version 5.15.10+dfsg-2.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | qt | qt |
>= 5.0.0, < 5.15.4 >= 6.0.0, < 6.2.9 >= 6.3.0, < 6.5.1 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:* |
| Ubuntu:Pro:16.04:LTS | canonical | qtbase-opensource-src |
< 5.5.1+dfsg-16ubuntu7.7+esm1 Fix: upgrade to 5.5.1+dfsg-16ubuntu7.7+esm1
|
| Ubuntu:Pro:18.04:LTS | canonical | qtbase-opensource-src |
< 5.9.5+dfsg-0ubuntu2.6+esm1 Fix: upgrade to 5.9.5+dfsg-0ubuntu2.6+esm1
|
| Ubuntu:Pro:20.04:LTS | canonical | qtbase-opensource-src |
< 5.12.8+dfsg-0ubuntu2.1+esm1 Fix: upgrade to 5.12.8+dfsg-0ubuntu2.1+esm1
|
| Ubuntu:22.04:LTS | canonical | qt6-base | All versions |
| Ubuntu:Pro:22.04:LTS | canonical | qtbase-opensource-src |
< 5.15.3+dfsg-2ubuntu0.2+esm1 Fix: upgrade to 5.15.3+dfsg-2ubuntu0.2+esm1
|
| Debian:12 | debian | qt6-base |
< 6.4.2+dfsg-10 Fix: upgrade to 6.4.2+dfsg-10
|
| Debian:12 | debian | qtbase-opensource-src |
< 5.15.8+dfsg-11 Fix: upgrade to 5.15.8+dfsg-11
|
| Debian:12 | debian | qtbase-opensource-src-gles | All versions |
| Debian:13 | debian | qtbase-opensource-src-gles |
< 5.15.10+dfsg-2 Fix: upgrade to 5.15.10+dfsg-2
|
Original advisory text
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.
References
- https://ubuntu.com/security/CVE-2023-33285 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2023-33285 Third Party Advisory
- https://codereview.qt-project.org/c/qt/qtbase/+/477644 URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/33xxx/CVE-2023-33285... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-33285 Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/04/msg00027.html Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2023-33285 Vendor Advisory
- https://ubuntu.com/security/notices/USN-7780-1 Vendor Advisory
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker partial control
Type
CWE-125Out-of-bounds Read
Timeline
Published22 May 2023
Updated31 Oct 2026
First seen12 Apr 2026
Sources
CVE-2023-33285 · OSV
CVE-2023-33285 · NVD
UBUNTU-CVE-2023-33285 · OSV
DEBIAN-CVE-2023-33285 · OSV
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