CVE-2025-32910
📋 TL;DR
A NULL pointer dereference vulnerability in libsoup's soup_auth_digest_authenticate() function can cause client applications to crash when processing malformed authentication responses. This affects any application using libsoup for HTTP client functionality with digest authentication. The vulnerability is triggered by specific server responses during authentication.
💻 Affected Systems
- libsoup
- Applications using libsoup library
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Denial of service causing libsoup-based applications to crash repeatedly, potentially disrupting critical client functionality that relies on HTTP communication.
Likely Case
Intermittent crashes of libsoup client applications when connecting to servers that send malformed digest authentication responses, leading to service disruption.
If Mitigated
Minimal impact with proper input validation and crash recovery mechanisms in place; applications may experience brief interruptions but can recover automatically.
🎯 Exploit Status
Exploitation requires control over server responses during digest authentication; attacker needs to be in position to send malformed authentication responses to vulnerable clients.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libsoup 3.4.6 and later
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-32910
Restart Required: Yes
Instructions:
1. Update libsoup package using system package manager. 2. For Red Hat systems: 'yum update libsoup'. 3. For Debian/Ubuntu: 'apt update && apt upgrade libsoup3.0'. 4. Restart affected applications using libsoup.
🔧 Temporary Workarounds
Disable Digest Authentication
allConfigure applications to avoid using digest authentication where possible
Application-specific configuration; check documentation for disabling digest auth
Network Filtering
linuxRestrict client connections to trusted servers only
iptables -A OUTPUT -p tcp --dport 80 -d trusted_server_ip -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -d trusted_server_ip -j ACCEPT
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement application-level crash recovery and restart mechanisms
- Monitor for application crashes and investigate connections to untrusted servers
🔍 How to Verify
Check if Vulnerable:
Check libsoup version: 'pkg-config --modversion libsoup-3.0' or 'rpm -q libsoup' or 'dpkg -l | grep libsoup'Check Version:
pkg-config --modversion libsoup-3.0Verify Fix Applied:
Verify version is 3.4.6 or higher: 'pkg-config --modversion libsoup-3.0' should show >=3.4.6📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation fault in libsoup functions
- Stack traces showing soup_auth_digest_authenticate()
Network Indicators:
- HTTP 401 responses with malformed WWW-Authenticate headers
- Unusual authentication failures from specific servers
SIEM Query:
process.name:application_name AND event.type:crash AND stack_trace:*soup_auth_digest_authenticate*