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Ubuntu LinuxOperating system · Canonical

CVE-2015-7802

MEDIUM · 5.5 CVSS v3.0 Published 2016-04-20
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
58/100
Remediation priority · Elevated
No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
gifread.c in gif2png, as used in OptiPNG before 0.7.6, allows remote attackers to cause a denial of service (uninitialized memory read) via a crafted GIF file.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A vulnerability exists in gifread.c in gif2png (used by OptiPNG before version 0.7.6) where the code reads uninitialized memory when processing a crafted GIF file. This uninitialized memory read can cause a denial of service condition.

MitigationUpgrade OptiPNG to version 0.7.6 or later, which includes the patched gif2png component that properly initializes memory before reading in the GIF parsing routine.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ubuntu LinuxOperating system
Affected:= 12.04= 14.04= 15.10
OptipngApplication
Affected:= 0.7.5

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify OptiPNG is installed
    Run `optipng --version` or check for the optipng package using your system package manager (e.g., `dpkg -l | grep optipng` on Debian/Ubuntu, `rpm -qa | grep optipng` on RHEL/CentOS)
    Affected if OptiPNG is installed and the version is 0.7.5 or earlier
  2. Confirm installed OptiPNG version
    Examine the version number output from `optipng --version`. Compare it against the affected version 0.7.5
    Affected if Version is 0.7.5 or any version lower than 0.7.6
  3. Check for gif2png component
    Look for the gif2png binary or library on the system (e.g., `which gif2png`, `find /usr -name gif2png*`, or check within the OptiPNG installation directory)
    Affected if gif2png is present on the system and is from an unpatched OptiPNG installation (pre-0.7.6)
  4. Identify Ubuntu distribution version
    Run `lsb_release -r` or check `/etc/lsb-release` to determine if the system is running Ubuntu 12.04, 14.04, or 15.10
    Affected if System is Ubuntu 12.04, 14.04, or 15.10 and has OptiPNG installed from the distribution packages

A user is affected if OptiPNG version 0.7.5 or earlier (or from Ubuntu 12.04/14.04/15.10 repositories) is installed and the gif2png component is present on the system.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade OptiPNG to version 0.7.6 or later, which includes the patched gif2png component that properly initializes memory before reading in the GIF parsing routine.

Fix this in Ubuntu Linux Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
5.0 hours of engineering $860
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2015-7802 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data