# CVE-2013-1620: Information disclosure in n/a

> Remote attackers can recover plaintext from TLS connections by analyzing timing side-channels during malformed CBC padding checks in the NSS library.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:P/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Feb 2013
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2013-1620, GHSA-4pp6-m86c-j4gj

## What is CVE-2013-1620?

CVE-2013-1620 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 8 Feb 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The TLS implementation in Mozilla Network Security Services (NSS) does not properly consider timing side-channel attacks on a noncompliant MAC check operation during the processing of malformed CBC padding, which allows remote attackers to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data for crafted packets, a related issue to CVE-2013-0169.

Weakness: CWE-203 (Observable Discrepancy)

## Which versions are affected by CVE-2013-1620?

It affects 15 products.


Products: Canonical Ubuntu Linux, Mozilla Network Security Services, Oracle Enterprise Manager Ops Center, Oracle Glassfish Communications Server, Oracle Glassfish Server, Oracle Iplanet Web Proxy Server, Oracle Iplanet Web Server, Oracle Opensso, Oracle Traffic Director, Oracle Vm Server, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Workstation.

## How do I fix CVE-2013-1620?

Upgrade to a fixed version.

## Is CVE-2013-1620 being exploited?

There is no known exploitation of CVE-2013-1620 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-1620 and fix it if it is affected.

What it is: CVE-2013-1620 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 8 Feb 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2013-1620 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2013-1620/ (Markdown: https://insights.sbomify.com/CVE-2013-1620/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-1620
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-1620
- OSV: https://osv.dev/vulnerability/CVE-2013-1620

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From sbomify Insights: https://insights.sbomify.com/CVE-2013-1620/
Summaries are generated and may contain mistakes; the official description above is the record.